Fill in when, as soon as, as, while, by the time, whenever, the moment that, till/until, after, before, as long as.

1) I'll call you .. I return home.

2) The rain had stopped .. we arrived at the station.

3) .. we finish doing homework, we'll tell you.

4) You should call me .. you get the e-mail. I won't be sleeping.

5) Let's go for a walk .. the rain stops.

6) .. I saw her, I understood she was the person to admire.

7) We had decided to mop the floor .. mother came home

8) I am free now, so I can wait .. 3 p.m. You don't need to hurry.

9) Let him know what has happened .. he arrives.

10) Don't tell anyone about our problem .. we cope with it.

1) I'll call you when I return home.
Explanation: The word "when" is used to indicate a specific point in time or an event that will happen in the future. In this sentence, the action of calling will happen at the moment or shortly after the person returns home.

2) The rain had stopped by the time we arrived at the station.
Explanation: The phrase "by the time" is used to show that one action happened before another action in the past. In this sentence, the rain had already stopped before the arrival at the station.

3) As soon as we finish doing homework, we'll tell you.
Explanation: The phrase "as soon as" is used to indicate that one action will happen immediately after another action is completed. In this sentence, the telling will happen right after the finishing of the homework.

4) You should call me whenever you get the email. I won't be sleeping.
Explanation: The word "whenever" is used to indicate that the action can happen at any time. In this sentence, the person should call as soon as they receive the email, regardless of the time.

5) Let's go for a walk as soon as the rain stops.
Explanation: The phrase "as soon as" is used to indicate that one action will happen immediately after another action occurs. In this sentence, the going for a walk will happen right after the rain stops.

6) The moment that I saw her, I understood she was the person to admire.
Explanation: The phrase "the moment that" is used to indicate that one action happened at the exact time or instant of another action. In this sentence, the understanding occurred right at the moment of seeing her.

7) We had decided to mop the floor before mother came home.
Explanation: The word "before" is used to show that one action happened prior to another action. In this sentence, the decision to mop the floor happened before the mother's arrival.

8) I am free now, so I can wait till/until 3 p.m. You don't need to hurry.
Explanation: The words "till/until" are used to indicate a specific point in time or an event that will happen in the future. In this sentence, the action of waiting will continue until the time reaches 3 p.m.

9) Let him know what has happened as soon as he arrives.
Explanation: The phrase "as soon as" is used to indicate that one action will happen immediately after another action occurs. In this sentence, letting him know about the events will happen right after his arrival.

10) Don't tell anyone about our problem as long as we cope with it.
Explanation: The phrase "as long as" is used to indicate a condition that must be fulfilled for the action to happen. In this sentence, the action of telling anyone about the problem should not occur as long as the person is handling or managing it.