It is/has been + Duration + Since + Simple Past
This specific structure is used to express how much time has passed *since* a particular event occurred in the past. The main clause uses 'It is' or 'It has been' followed by a duration, and the 'since' clause uses the Simple Past tense.
- âĻ Rule 1: Structure: It is / It has been + Duration + since + Subject + Simple Past (V2). Example: It has been five years since I last visited my hometown.
- âĻ Rule 2: Both 'It is' and 'It has been' are generally acceptable, but 'It has been' is often preferred as it emphasizes the duration up to the present. Example: It is a long time since we met. (Also correct: It has been a long time since we met.)
- âĻ Rule 3: The 'since' clause always describes a completed action in the past, hence the use of Simple Past tense. This structure highlights the *length of time* that has elapsed.
Which of the following sentences is grammatically correct?