First, to correct your sentences: "I wonder how native English speakers use the right tense while speaking. I always forget to use a tense, or I just use the wrong one." Now, to answer your question... It's the same with every language, I'd assume. When you get more intimate with a language, you begin subconsciously determining whether an action has occurred, is occurring, or will occur. No English speaker ever has to think of such things unless they're trying to say a really complicated sentence. Again, I assume it's the same with Mandarin or Cantonese. You know when a verb should be in the past, present, or future almost instinctively, while I would have a hard time for a while if I tried to learn either one. And you can't really "forget" to use a tense. No matter what you say, it will be in at least one of the major tenses (and then in one of the auxiliary tenses). Perhaps you're using the wrong terminology? At any length, just keep practicing with native English speakers. Your brain will begin automatically doing the right things when you speak a language long enough, until it becomes second nature to you.