1. Ascertain

2. Assertain

3. Ascertain

4. asartain

1. The man was tall who stole my bag.

2. The man stole my bag who was tall.

3. The man who stole my bag was tall.

4. The man was tall who is stealing tall my bag.

1. Is burning

2. Burnt

3. Will burn

4. Was burning

1. Away

2. Up

3. Off

4. Out

1. He is being gone to open a shop

2. A shop is being gone opened by him

3. A shop will be opened by him

4. A shop is going to be opened by him