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English With Lucy C1 [exclusive]

: Use the structure "What [clause] + be + [clause]" to highlight specific information (e.g., "What I found most interesting was the use of idioms" ). Example C1 Text (Professional/Academic Style)

Welcome to "English with Lucy C1", your go-to platform for achieving fluency in English! I'm Lucy, your friendly English teacher, and I'm here to guide you through the exciting world of C1-level English. english with lucy c1

According to the CEFR criteria posted by English with Lucy , a true C1 speaker can: : Use the structure "What [clause] + be

Lucy teaches these not through dry textbook exercises, but through "real-life scenarios" like office emails, academic essays, and political debates. According to the CEFR criteria posted by English

Use language flexibly and effectively for social, academic, and professional purposes.

Visit the English with Lucy official website to take her free level assessment. If you score 70% or higher on the B2 test, you are ready for the C1 challenge. Good luck, and happy studying.

Lucy’s instructional style leans heavily toward Modern Standard British English (Received Pronunciation). For a C1 student, her catalog offers specific pillars designed to elevate your linguistic precision. Advanced Vocabulary and Idioms

 footprint_model: # types: "point", "circular", "two_circles", "line", "polygon"
    type: "polygon" #"circular" 
    radius: 0.38 # for type "circular"
    #line_start: [-0.3, 0.0] # for type "line"
    #line_end: [0.3, 0.0] # for type "line"
    #front_offset: 0.2 # for type "two_circles"
    #front_radius: 0.2 # for type "two_circles"
    #rear_offset: 0.2 # for type "two_circles"
    #rear_radius: 0.2 # for type "two_circles"
    vertices: [ [0.26, 0.26], [0.26, -0.26], [-0.26, -0.26], [-0.26,0.26] ]   # for type "polygon"

  inflation_dist: 0.0
  dynamic_obstacle_inflation_dist: 0.05
  include_costmap_obstacles: True
  costmap_obstacles_behind_robot_dist: 0.1
  obstacle_poses_affected: 25 #30
  costmap_converter_plugin: ""
  costmap_converter_spin_thread: True
  costmap_converter_rate: 5

footprint: [ [0.26, 0.26], [0.26, -0.26], [-0.26, -0.26], [-0.26,0.26] ]
# robot_radius: 0.38 #0.38 
# footprint_padding: 0.05 
map_type: voxel
#track_unknown_space: true

obstacle_layer:
    origin_z: -0.1
    z_resolution: 1.8 #1.5 This must be higher than the z coordinate of the mounted lidar
    z_voxels: 1 
    obstacle_range: 10.0 #10.0
    raytrace_range: 15.0 #15.0
    observation_sources: laser_scan_sensor
    track_unknown_space: true
    lethal_cost_threshold: 100
    unknown_cost_value: 255 

    laser_scan_sensor: {data_type: LaserScan, topic: /scan, marking: true, clearing: true, min_obstacle_height: 0.00, max_obstacle_height: 3.00}
#point_cloud_sensor: {sensor_frame: lslidar_c16_frame, data_type: PointCloud2, topic: /lslidar_c16/lslidar_point_cloud, marking: true, clearing: true}
    
lowbstacle_layer:
    origin_z: -0.1
    z_resolution: 1.8
    z_voxels: 1
    obstacle_range: 3.5 #if beyond this threshold, then will not mark as obstacle
    raytrace_range: 5.0 #5.0 Lower this value to detect nearer obstacles with better accuracy
    observation_sources: obs_cloud mock_scan #butt_scan1 butt_scan2
    publish_voxel_map: true
    track_unknown_space: true
    lethal_cost_threshold: 100
    unknown_cost_value: 255

    obs_cloud:
        data_type: PointCloud2
        topic: /obstacles_cloud
        marking: true
        clearing: true
        min_obstacle_height: 0.01
        max_obstacle_height: 0.99
    mock_scan:
        data_type: LaserScan
        topic: /obstacles_scan
        marking: false
        clearing: true 
        min_obstacle_height: 0.00
        max_obstacle_height: 1.00
        inf_is_valid: true

inflation_layer:
    enabled: true
    cost_scaling_factor: 6.0 #added in by John
    inflation_radius: 0.39 #0.45 #Minimum value: 0.379
    
dynamic_obstacle_layer:
    enabled: false
    map_tolerance: 0.2
    footprint_radius: 0.5
    range: 2.0

  plugins:
    - {name: static_layer, type: "costmap_2d::StaticLayer"}
    - {name: obstacle_layer, type: "costmap_2d::VoxelLayer"}
    - {name: lowbstacle_layer, type: "costmap_2d::VoxelLayer"}
    - {name: dynamic_obstacle_layer, type: "dynamic_obstacle_layer::DynamicLayer"} # Uncomment to apply dynamic_obstacle_layer
    - {name: inflation_layer, type: "costmap_2d::InflationLayer"}

  plugins:
    - {name: obstacle_layer, type: "costmap_2d::VoxelLayer"}
    - {name: lowbstacle_layer, type: "costmap_2d::VoxelLayer"}
    - {name: inflation_layer, type: "costmap_2d::InflationLayer"}
    # - {name: range_sensor_layer, type: "range_sensor_layer::RangeSensorLayer"}

obstacle_layer:
    origin_z: -0.1
    z_resolution: 1.8 #1.5 This must be higher than the z coordinate of the mounted lidar
    z_voxels: 1 
    obstacle_range: 10.0 #10.0
    raytrace_range: 15.0 #15.0
    observation_sources: laser_scan_sensor
    track_unknown_space: true
    lethal_cost_threshold: 100
    unknown_cost_value: 255 

    laser_scan_sensor: {data_type: LaserScan, topic: /scan, marking: true, clearing: true, min_obstacle_height: 0.00, max_obstacle_height: 3.00}
    #point_cloud_sensor: {sensor_frame: lslidar_c16_frame, data_type: PointCloud2, topic: /lslidar_c16/lslidar_point_cloud, marking: true, clearing: true}

lowbstacle_layer:
    origin_z: -0.1
    z_resolution: 1.8
    z_voxels: 1
    obstacle_range: 3.5 #if beyond this threshold, then will not mark as obstacle
    raytrace_range: 5.0 #5.0 Lower this value to detect nearer obstacles with better accuracy
    observation_sources: obs_cloud mock_scan #butt_scan1 butt_scan2
    publish_voxel_map: true
    track_unknown_space: true
    lethal_cost_threshold: 100
    unknown_cost_value: 255

    obs_cloud:
        data_type: PointCloud2
        topic: /obstacles_cloud
        marking: true
        clearing: true
        min_obstacle_height: 0.01
        max_obstacle_height: 0.99
    mock_scan:
        data_type: LaserScan
        topic: /obstacles_scan
        marking: false
        clearing: true 
        min_obstacle_height: 0.00
        max_obstacle_height: 1.00
        inf_is_valid: true