Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

Sentence 1: A man holds on to a handle in the water. Sentence 2: A man is holding onto handles in the air.
3

Sentence 1: A toy train is striking a toy car. Sentence 2: A toy train strikes a toy car.
5

Sentence 1: An old woman is shaking hand with a man. Sentence 2: A man and a woman shake hands.

4