Need help with tenses

English is not my first language and while I sound fluent I don't have the best grasp of English grammar. All the different tenses always confuse me in writing. Mandarin is my first language and it doesn't really have tenses. Instead it rely on context to indicate time by adding words such as “yesterday” or “two hours ago” or "in the future" in a sentence.

So can anyone here recommend me some good resources/sites/books on English tenses? Thanks in advance.

Edit: I prefer something interactive or have exercises. I learn best that way.