`1,`

What are you doing? 

`->` Wh-qs + tobe + S + V_ing?

`2,` 

I like reading a comic book.

`->` S+ like + V_ing + O

`3,`

Bring your raincoat because it is rainy today.

`->` Imperative V + O + because + S + V + Adj + time expression.

`4,` 

I cannot make spring rolls.

`->` S + modal verb + base V + O.