Recovered my scripts. Many errors

Do you know whats wrong with my code? I cant seem to get off of 4 errors, one is "} expected". The other 3 are "A using clause must precede all other elements defined in the namespace except extern alias declarations". Here is my code-

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class MouseLook : MonoBehaviour { public float mouseSpeed = 100f; public Transform playerBody; float xRotation = 0f;

 void Start()
 {
     Cursor.lockState = CursorLockMode.Locked;
 }
 void Update()
 {
     float mouseX = Input.GetAxis("Mouse X") * mouseSpeed * Time.deltaTime;
     float mouseY = Input.GetAxis("Mouse Y") * mouseSpeed * Time.deltaTime;


     xRotation -= mouseY;
     xRotation = Mathf.Clamp(xRotation, -90f, 90f);

     transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
     playerBody.Rotate(Vector3.up * mouseX);
 }

}

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class PlayerMovement : MonoBehaviour { public CharacterController controller;

 public float speed = 10f;
 public float gravity = -10f;
 public float jumpHeight = 5f;

 public Transform groundCheck;
 public float groundDistance = 0.4f;
 public LayerMask groundMask;

 Vector3 velocity;
 bool isGrounded;

 void Update()
 {
     isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);

     if (isGrounded && velocity.y < 0)
     {
         velocity.y = -2f;
     }

     float x = Input.GetAxis("Horizontal");
     float z = Input.GetAxis("Vertical");

     Vector3 move = transform.right * x + transform.forward * z;

     controller.Move(move * speed * Time.deltaTime);

     if (Input.GetButton("Jump") && isGrounded)
     {
         velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
     }

     velocity.y += gravity * Time.deltaTime;

     controller.Move(velocity * Time.deltaTime);

 }