Why don’t you stop bothering me? Can’t you see that I think about it at the moment.

think → am thinking

As his parents, he also studied medicine and became a well-known doctor.

As → Like

One friend of her has been staying in her house for more than two weeks so far.

her → hers

It is very bad when husbands and wives shout at themselves very often.

themselves → each other

This series of articles are about how to improve one’s English proficiency.

are → is