Hi Lui ! Here you should say, "Kevin contributed a lot on the pitch presentation yesterday". So "contributed on" is correct, however the 'was' in this sentence is unnecessary. :) -Katy

I think Katy's answer is unfortunately quite misleading. "Kevin contributed a lot on the pitch presentation yesterday" is grammatically correct, however here she has used "contributed" on its own, it is not connected to the "on", which belongs together with "on the pitch presentation". As Neil pointed out, "contribute to" is correct, because the idea is that you contribute towards something. This "towards" is then shortened to simply "to". "Contribute on" is grammatically incorrect. Here are some more examples with "contribute" and "contribute to": - What is he contributing to the project? - You should donate some money to help contribute towards cancer research. - During the job interview, the he asked me: "What can you contribute to the company?".

Unfortunately no. The way you have stated it, Kevin was contributed to, not the pitch. Imagine with a different verb: Kevin was rushed on the pitch.... So to change the direction of the contribution, it is important both to show correctly who did the contributing, where it went to. Kevin contributed a lot 'to' the presentation yesterday. I also omitted pitch because in the context, it means the same thing as presentation. Two words together that mean the same thing cause a duplication, unless one of them is modifying the other. Example: Kevin contributed a lot 'to' the Sales presentation yesterday.

We say contribute 'to' something. "Kevin contributed a lot to the presentation yesterday"