Sothat/Inorder that
S-1:Sub+present form of principal verb+…(n/adj/adv)+sothat/inorder that+sub(2)+can/may+base form of principal verb+…
Ex.He goes to library sothat he can study there.

S-2:Sub+past form of principal verb+…(n/adj/adv)+sothat/inorder that+sub(2)+could/might+base form of principal verb+…
Ex:He went to market sothat he could buy a shirt.

So..that
S:Sub+verb+so+adj…+that+sub(2)+can/may/could/might+(not)+base form of principal verb+…
Ex:a)He is so weak that he can not walk.
b)He was so weak that he could not walk.
c)He is so intelligent that he can understand everything.

While
S-1:While+principal verb+ing+..(n)+sub+past form of principal verb+…n
Ex:While walking in the garden,she saw a snake.
S-2:While+sub+was/were+principal verb+ing+..(n)+sub(2)+past form of principal verb+..n
Ex:While she was walking in the garden,she saw a snake.

It is high time
S:It is high time+sub+past form of principal verb+…n.
Ex:It is high time we stopped corruption.

Nosooner had..
Nosooner had+sub+past participle form of principal verb+..obj+than+sub(2)+past form of principal verb+…noun.
Ex:Nosooner had the king touched the flower than it turned into gold.

Scarcely/Hardly had..
S:Scarcely/Hardly+had+sub+past participle form of principal verb+..obj+when+sub(2)+past form of principal verb+…noun
Ex:Hardly had he seen his father when he ran away.

Md. Rafiqunnabi Lecturer, Department of English, Govt. Mujibur Rahman Women’s College, Bogura.