DIRECTIONS: Fill in the blank with the right options provided. Both of them…

Correct sentence: Both of them have been working here since their childhood.

Why this is correct:

• The word "since" refers to a specific point in time in the past (their childhood).

• To show an action that started at that past point and continues to the present, use a present perfect form. The present perfect continuous (have been + verb-ing) emphasizes ongoing activity and duration.

• The plural subject "Both of them" requires "have" (not "has").

Why the other choices are wrong:

• "are working here": This is present continuous (action happening now) and does not express continuation from a past starting point.

• "work here": Simple present states a habitual/general fact and cannot alone show that the activity began in the past and continues to now with "since".

• "are liking to work": Unnatural/incorrect because "like" is normally stative and not used in continuous forms; also the tense does not show continuation from a past point.

Summary: Use the present perfect continuous "have been working" to show an action that started in the past (their childhood) and continues up to now.