Here are the corrections for each sentence:

1. The boy was enough intelligent to solve that problem.
=> The boy was intelligent enough to solve that problem.

2. The girl helped me with the needlework yesterday is my classmate.
=> The girl who helped me with the needlework yesterday is my classmate.

3. They asked their friends not play soccer in the road.
=> They asked their friends not to play soccer in the road.

4. Hanh is the same weigh as my sister.
=> Hanh is the same weight as my sister.

5. It is careless for you to leave your book on the train.
=> It is careless of you to leave your book on the train.