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After finishing this project, he felt tired.

After finish this project, he felt tired.

How long this contract is available?

How long is this contract available?

How long will this contract available?

There are many boo boos on/in this project.

He had extortion about 3 million to her family.

There are many fruit/fruits on that table.

You may have a break after you finish the class.

You may have a break after finishing the class.

You may have a break when your class is over.

Ps. pls correct them for me if you find weird in those sentences. Thank you very much!!!
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These are correct:

After finishing this project, he felt tired.

After he finished this project, he felt tired.

How long is this contract available?

How long will this contract be available?

There are many errors/mistakes in this project.-- Use 'boo-boo' with children or your boyfriend.

He extorted about $3 million from her family.

There is a lot of fruit on that table.

You may have a break after you finish the class.

You may have a break after finishing the class.

You may have a break when your class is over.
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Thank you very much!!! :-)