1.一般现在时：表示经常性，习惯性的动作。
常与表示频度的时间状语every day. usually. always often sometimes on sunday等连用。
1）构成：先看主语。 主语是三单，动词加s。 主语是非三单，动词用原形。
例子：they often watch tv.
he often watches tv.
2)变化： 一般疑问句：主语前加do或does,动词用原形。
否定句：主语后加don`t或doesn`t ,动词用原形。
例子：do they often watch tv? they don`t often watch tv.
does he often watch tv? he doesn`t often watch tv.
2.现在进行时：表示现在正在发生的动作，句中常有now look listen等。
1）构成：主语+be+doing例子：she is watching tv now.
2）变化：一般疑问句：提前be(am are is) 例子：is she watching tv now?
否定句：be后加not例子：she isn`t watching tv now.
3.一般过去时：表示过去的动作或状态，句中常有yesterday last等过去的时间。
1）构成： 表示动作时：主语+动词的过去式例子：she watched tv last night.
表示状态时：主语+was/were(句中没实意动词） she was here last night.
2)变化：一般疑问句：主语前加did,动词用原形。
did she watch tv last night ? was she here last night?
否定句：主语后加didn`t,动词用原形。
she didn`t watch tv last night. she wasn`t watch tv last night.
4.一般将来时：表示将来发生的时间或动作，句中有表示将来的时间：tomorrow next soon in two days等。
1）构成：主语+will+do(任何人称） she will watch tv this evening.
主语+shall+do(仅第一人称i we) we shall watch tv this evening.
主语+be doing to+doshe is going to watch tv this evening.
2)变化：一般疑问句：提前will/ shall / be
例子：will she watch tv this evening?
shall we watch tv this evening?
is she going to watch tv this evening?
3)否定句：在will/ shall / be后加not.
she won`t watch tv this evening
we shall not watch tv this evening.
she isn`t going to watch tv this evening.
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