Present Perfect - For Or Since?

The word "since" is the correct answer because it indicates a specific point in time when the action of raining started. In this case, the action of raining started on Monday and has continued since then. The word "for" would be incorrect because it implies a duration of time, rather than a specific starting point.

The correct answer is "for" because it indicates a duration of time. In this context, it implies that the weather has been cold for a certain number of days. "Since" would imply a specific starting point in time, which is not provided in the sentence.

The word "for" is the correct answer because it is used to indicate a duration of time. In this sentence, it implies that the speaker has been sick for a period of three days. The word "since" would not be appropriate here because it is used to indicate a specific point in time when an action started, rather than a duration of time.

The correct answer is "since". In this sentence, the word "since" is used to indicate the time period from when the speaker last heard from their uncle. It implies that the speaker has not received any communication from their uncle from a specific point in the past until the present moment. The word "for" would not be appropriate in this context as it indicates a duration of time rather than a specific point in time.

The correct answer is "for." This is because the phrase "for two quarters" indicates a duration of time, suggesting that the speaker has been a student at UCI for a specific period of time.

The correct answer is "Since". "Since" is used to indicate that the person has been in the U.S. till the present, starting from June 2nd.