Help me with this English homework.

#2 doesn’t make sense, because the training doesn’t test the product, it’s the skills learned while being trained that help us when we test the product.

#1 The same problem as #2, it is a bit confusing if the training will be testing the product, or helping the people that are testing the product.

#3 is right because it has a preposition tied to a gerund. The in is not redundant, it preposes the subject as using the training in the process of testing.

I am not an English expert.

I think sentence number 1 is written poorly. Doesn’t sound right to me. 2 and 3 are fine, I like 3 best. I actually would write it using “when” instead of in, but I think in is good also.

#2 and #3 are grammatically correct, but #1 isn’t.

@zenvelo might be right about #2, though I think most people will understand what you mean.

I like number 2 and number 3 equally.

I go along with @zenvelo. #3 makes the most sense and #1 is grammatically incorrect. You don’t use training the way you use a shovel to dig a hole. You can use what you learned in the training, or you can say that the training has prepared you for testing.

To test.

Thank you folks! :D