Exercise 4: Correct the Mistakes. Find and correct the mistakes in the sentences. 1.She is cook dinner now. 2. They was playing football at 2 PM yesterday. 3.I am not understanding this exercise. 4. We were watch a movie at 12 PM last night. 5.He is run in the park. 6. The birds were sing when I woke up. 7. What are you do? 8.She were reading a book at 6 PM. 9. The children is sleeping now.

Exercise 4: Correct the Mistakes.

Here are the corrected sentences with explanations:

1. She is cooking dinner now. (Present Continuous: subject + is/am/are + verb-ing)
2. They were playing football at 2 PM yesterday. (Past Continuous: subject + was/were + verb-ing; 'They' is plural, so 'were' is needed.)
3. I am not understanding this exercise. (Present Continuous is commonly used for verbs expressing a state of mind like 'understand' when referring to a current situation. However, 'I do not understand' is also correct and more common for a general lack of understanding. Given the context of an ongoing exercise, 'am not understanding' can be acceptable but 'do not understand' is generally preferred for clarity.)
4. We watched a movie at 12 PM last night. (Past Simple: for a completed action at a specific time in the past. Or, 'We were watching' if the focus is on the ongoing nature of the action.)
5. He is running in the park. (Present Continuous: subject + is/am/are + verb-ing)
6. The birds were singing when I woke up. (Past Continuous: 'were singing' describes an ongoing action interrupted by another action 'woke up'.)
7. What are you doing? (Present Continuous: for an action happening now.)
8. She was reading a book at 6 PM. (Past Continuous: for an action in progress at a specific time in the past.)
9. The children are sleeping now. (Present Continuous: 'children' is plural, so 'are' is needed.)