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Present Perfect

The present perfect is used to express a past event that has present consequences. An example is "I have eaten" (so I'm not hungry). In English, the present perfect is a present-tense use of the perfect, which means that it is used to refer to a subject's past actions or states while keeping the subject in a present state of reference or in a present state of mind.Think of the words in the construction separately: "have" (or "has") refers the present.

Past perfect

Past perfect is a combination of tense and aspect. It is used to refer to an event that had continuing relevance to a past time. Pluperfect of state,where the consequence of some event is associated with that event during a narration in the past tense: "He saw that the door had opened, and children were running through it." is nearly the same as "...He saw that the door was open, and children...” A pluperfect of state is, in association to the fact of the action, midway between the past tense (the door opened yesterday) and the predicate adjective that is the past participle (the door was open since yesterday).

Simple Future

Future tense is a verb form that marks the event described by the verb as not having happened yet, but expected to happen in the future, or to happen subsequent to some other event, whether that is past, present, or future.
The most common auxiliary verbs used to express futurity are will and shall.
, they are generally used interchangeably, with will being more common.

Present Continuous

The continuous is marked by the suffix -ing. It is generally used for actions that are actively on-going at the time in question, and does not focus on the larger time-scale. For example, the sentence "John was playing tennis when Jane called him." indicates what John was doing when Jane called him, but does not indicate for how long John played, nor how often he plays; for that, the simple past would suffice: "John played tennis three hours every day for several years."

Present perfect tense
eg: I have seen that movie already. (no specific time)
** see -> have seen

Past perfect Tense
eg: I had seen that movie before I bought the DVD. (specific time)
** see -> had seen

Simple future tense
eg: I will see that movie tomorrow.
** see -> will see

Present continuous tense
eg: I can't talk now. I am watching movie.
** watch -> am watching