1 . Do you want me to help you. 

<=> Shall I help you?

2 . We must go now

<=> We must go there on time

3 . The sun is shinning today 

<=> It is sunny today

4.  My friend doesn't have any stamps 

<=> My friend has no stamp

5. Is there a garden in your house?

<=> Does your house have a garden?

It hard to teach such naughty children,whether you are an experienced teacher or not.

---> However you are experienced teacher or not, it hard to teach such naughty children.