it's really hard to answer... for example, if you say 映画を見る＝I watch a movie.　映画を見て＝I watch a movie and do something. if you say 見て、 some other actions are following after watching. can you see?? and also you can say 見て when you order somebody to look at something. ex. Look at it! それを見て！ the difference between 違う　and 違います is just if it's a polite form or casual one. when you put ます, it shows a respect to the person who you are talking to. and also た is used for the past tense.　見た＝I watched. I'm sorry that I can't explain very well. I hope it helps.

I think the explanation from mikity is more or less correct. I agree with her and my opinion is as follows. I haven't counted how many different endings there are but I'm sure that there are so many!! I think the best way to learn them is to imitate just same as we say and to be corrected when you make mistakes. I think verbs which end u sounds like 見る(miru), 聞く(kiku), or 話す(hanasu) are usually the basic forms of verbs. The ends must be changed according to what words continue after the verbs, when you do so or the events happen, whom you talk to, or etc. For example, 見ない, 見なかった, 見えない, 見たら, 見ると, 見て, 見ます, 見ました, 見た.....etc. I dont think you have to learn them by heart. You will come to be able to use them fluently after you use them many times and make a lot of mistakes. Just relax and enjoy talking with Japanse. Sometimes Japanse might laugh at your mistakes but it's ok because such mistakes are unforgetable so you would never make the same mistakes again. Just laugh together^^ huhuh When I visited Canada, I wanted to say "my mother was pregnant with me" but I said "I was pregnant". I didnt know how to say that correctly at the moment. My Canadian friend told me how to say it. We laughed so much lol, huhuhuh^^

sorry ,i can't help you resolve japanese question! I can help you chinese!