"I finished my homework by the end of the day. " Decide if the sentences are correct () or not ().

"Before the class finishes, I will have completed the task. " Decide if the sentences are correct () or not ().

"They have visited three countries by the end of their holiday. " Decide if the sentences are correct () or not ().

"I will write two essays by the end of the week." Decide if the sentences are correct () or not ().