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The second question:

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The third question:

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The fourth question:

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This part of the extended information mainly examines the knowledge points of the present continuous tense:

Indicates the current behavior or state of being. In English tense, "time" refers to the time when the action takes place, and "state" refers to the appearance and state of the action. The present continuous tense indicates that the time when the action occurs is "now" and the current state of the action is "in progress".

When the words that indicate time appear in the sentence are now, this moment,; (now, now) and so on. The sentence is about what is happening now, and the verb is in the present continuous tense.

When adverbials of time appear in a sentence, such as these days, this week, this month, this semester, etc. If the sentence means what is happening at this stage, the verb is used in the present continuous tense.