Muhammad Yusuf, Features Writer Rubab Zahra is a calligraphy practitioner and an abstract artist who works in a contemporary ...

We use the past perfect continuous to describe an action or situation that was happening over a period of time up to another past event or point in time. It is often used to give background ...

We use the present perfect continuous to talk about an activity that started in the past and is continuing now or has recently finished. Some verbs are almost never used in the present perfect ...