Chicks are used to eating American food now.

• Explanation: This sentence expresses a habit or routine that has become familiar to chicks.

She finally got used to eating our food.

• Explanation: This sentence expresses a habit that someone has become accustomed to after a period of time.

He hasn't seen his brother recently.

• Explanation: This sentence expresses a past action that has not happened yet up to the present time.

I can't go to the movies with you if it rains heavily.

• Explanation: This sentence expresses a future condition and its consequence, so we use the simple present tense.

Lan takes to school every day when he was a child.

• Explanation: This sentence describes a past habit, so we use the simple past tense.

Would you mind showing me how to send an e-mail?

• Explanation: This is a polite request, so we use the -ing form.

The "Ao dai" has been mentioned in poems and songs for centuries.

• Explanation: This sentence expresses an action that started in the past and continues up to the present, so we use the present perfect tense.

What were your children doing when he came yesterday?

• Explanation: Both verbs refer to past actions that happened at the same time, so we use the past continuous tense for both.

My car hasn't been repaired yet.

• Explanation: This sentence expresses a past action that has not been completed yet, so we use the present perfect tense in the passive voice.

She bought this house for her son, didn't she?

• Explanation: This sentence describes a past action, so we use the simple past tense.

Where did you go if you had a car?

• Explanation: This is a hypothetical question about the past, so we use the simple past tense.

The children prefer watching TV to reading books.

• Explanation: This sentence compares two actions, so we use the -ing form.

She doesn't live with her parents. She lives alone.

• Explanation: The first sentence expresses a general fact, so we use the simple present tense. The second sentence also expresses a general fact, so we use the simple present tense.

I am staying with my parents at the moment though I have my own flat.

• Explanation: The first verb expresses a temporary action happening now, so we use the present continuous tense. The second verb expresses a possession, so we use the simple present tense.

Listen! Someone is knocking at the door.

• Explanation: This sentence describes an action happening at the present moment, so we use the present continuous tense.

I hope it doesn't rain when the bride leaves.

• Explanation: Both verbs express future actions, so we use the simple present tense.

What time does the bus leave for Dave tomorrow? - It leaves at 7:45.

• Explanation: Both verbs express future actions, so we use the simple present tense.

My father is always worrying about us.

• Explanation: This sentence describes a habitual action, so we use the present continuous tense.

Everything on the Earth is always changing.

• Explanation: This sentence describes a general truth, so we use the present continuous tense.

We are having a small party next Sunday. Would you like to come?

• Explanation: The first verb expresses a future plan, so we use the present continuous tense. The second verb is an invitation, so we use the infinitive form.

Look at that car. It is driving too fast. It will hit that cyclist.

• Explanation: The first verb describes an action happening at the present moment, so we use the present continuous tense. The second verb expresses a prediction about a future action, so we use the simple future tense.