很多小伙伴一直搞不懂英语的时态问题此刻英语，今天小编分享这个短片此刻英语此刻英语：4分钟带你掌握所用英语时态，收藏起来！，讲解详尽清晰此刻英语，帮你彻底搞懂。也是很好的听力素材~
时态（Tense）是表示行为、动作和状态在各种时间条件下的动词形式。而我们说时态结构的时候，指的是相应时态下的动词形式。
常用时态有12种：一般过去、一般现在、一般将来，以及这三者的进行时，完成时和完成进行时。其他时态很少单独使用！
Past
Simple
I atepizza yesterday.
我昨天吃的披萨。
-To indicate a past habit – or an action already completed.
表示过去的习惯或完成的动作。
Continuous
I was eatingpizza when you arrived.
当你到的那个时候我正在吃披萨。
-To indicate uncompleted action of the past (with or without time reference)
表示过去未完成的动作（通过过去的时间状语来判断）
-To indicate persistent habits of the past (with always, continuously, forever, ect.)
表示过去持续性的习惯或动作（和always, continuously, forever等词连用）
Perfect
I had eatenall of the pizza when you arrived.
你到的时候我已经吃完所有的披萨了。
-To indicate a completed action of the past that happened before another event took place.
表示在过去的某一时间或动作之前已经完成了的动作。
Perfect Continuous
I had been eatingpizza for 2 hours when you arrived.
你到的时候我吃了2个小时的披萨了都。
-To indicate an action in the past that began before a certain point in the past and continued up until that time.
表示动作从早些时候开始，持续到过去的某个点，并可能延续下去。
Present
Simple
I eatpizza everyday.
我每天都吃披萨。
-To express habits or general truth.
表示经常发生的动作或普遍的真理。
-To indicate a future event on a designed date as part of a plan or arrangement.
表示在时间上已确定或安排好的事情。
-With ‘mental action’ verbs: like, love, want, need, believe, ect.
表示知觉的动词如”like, love, want, need, believe”等常用一般现在时。
Continuous
I am eatingpizza right now.
我现在正在吃披萨。
-To indicate action going on at the time of speaking.
表示此时此刻（指说话人说话时）正在进行的动作。
-To indicate temporary action which may not be happening at the time of speaking.
表示现阶段正在进行的动作（说话时动作未必正在进行）。
-With a habitual action verb, especially to indicate a stubborn habit.
和习惯性动词连用时，尤其表示一个固执的行为习惯。
Perfect
I have eatenall of the pizza.
我刚吃了所有的披萨。
-To indicate past action which is not defined by a time of occurrence.
表示过去的一个动作，而动作发生的时间并无特殊表明。
-To indicate an action which started in the past and has continued up until now.
表示过去某事开始的动作一直持续到现在。
Perfect Continuous
I have been eatingpizza for 2 hours.
我吃了2个小时的披萨了。
-To indicate an action which started at some point in the past and may or may not be complete.
表示从过去某时延续到现在的动作，动作会延续下去，或是到说话时结束。
Future
Simple
I will eatpizza tomorrow.
明天我要吃披萨。
-To indicate an action, condition, or circumstance which hasn’t taken place yet.
表示还没有发生的动作、状态、或情况。
Continuous
I will be eatingpizza when you arrive.
你到的时候我会在吃披萨。
-To indicate what will be going on at some time in the future.
表示在将来的某点会发生的动作。
-To indicate planned future events.
表示计划好的将来事件。
Perfect
I will have eatenall of the pizza by the time you arrive.
你到的时候我就会已经吃完所有的披萨了。
-To indicate an action that will be complete before another event takes place.
表示在将来的一个动作前已经完成的动作。
Perfect Continuous
I will have been eatingpizza for 2 hours when you arrive. 等你到的时候我都已经吃了2小时披萨了。
-To indicate an action that will have happened for some time and will not be complete yet at a certain point in the future.
表示一个动作在将来的某个点已经持续了一段时间并且会延续下去。
在此基础上还有一个过去将来时：
