A tense is a means of putting a sentence into a timeframe. So if something is happening now we use the present tense. If something was happening, but it is not clear if it has finished, or something else happened whilst this was going on, then we use the imperfect tense. If something happened in the past and is now over, then we use the past tense (sometimes referred to as the perfect tense). If something happened some time ago and then something else took place after that, we would use the pluperfect tense. The future tense is used to denote something which will happen.
So, if we use the following sentence as an example:
I wash my hands (present) I was washing my hands (imperfect) I washed my hands (past or perfect) I had washed my hands (pluperfect).
All these have a different timeframe and need to be used consistently, otherwise it is hard to understand what is happening within a sentence. So we would not say, "I cried tomorrow", since cried is a past tense and the fact that tomorrow hasn't happened yet means that we should actually be using the future tense.
English has a wide variety of verbs that are irregular, which is to say that when they take a past or future tense, they don't follow any logical conclusion. As a precaution, make sure that you check all the tenses in any piece of work (either doing the checking yourself, or by applying a grammar checking application) so that you can be sure you have got all the correct tenses used with the correct use of the verb.
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