While he was to walk to work, it started raining.
While he was walking to work, it started raining.
Where is the meeting is unclear.
Where the meeting is is unclear.
Or
It is unclear where the meeting is.
The man who I met him yesterday is my neighbor.
The man whom I met yesterday is my neighbor.
After finish the test, students may leave.
After finishing the test, students may leave.
I’m not sure that should I call her.
I’m not sure whether I should call her.
The jacket what you bought doesn’t fit.
The jacket that you bought doesn’t fit.
Since moved here, I met many neighbors.
Since moving here, I met many neighbors.
That she can speaks five languages impresses everyone.
That she can speak five languages impresses everyone.
The woman who’s car was stolen reported it to the police.
The woman whose car was stolen reported it to the police.
While walking to the bus stop, the rain started pouring.
While I was walking to the bus stop, the rain started pouring.
I don’t understand why did he leave so suddenly.
I don’t understand why he left so suddenly.
The movie that I watched it last night was amazing.
The movie that I watched last night was amazing.
Although she studied hard, but she failed the test.
Although she studied hard, she failed the test.
I can’t remember what did he say during the meeting.
I can’t remember what he said during the meeting.
The building located downtown which was renovated recently looks new.
The building located downtown, which was renovated recently, looks new.