动词的时态1.I often (help) my mother do housework.2.She (visit) her grandparents yesterday.3.We (have) a meeting tomorrow. 4.Tom (clean) his bedroom now.5.He (read) a book when the storm came.6. He (work) here for over twenty years.help visited will have is cleaning was reading has worked 一般现在时一般过去时一般将来时现在进行时过去进行时现在完成时一般时态进行时态完成时态eg：I often do sports.1.表示现阶经性习惯性的动作，与频度副词连用。2.表示客观真理 客观存在或自然现象。eg：The earth moves around the sun.注意：宾语从句中，即使主句是一般过去式，从句也要用一般现在时。 I’ll tell him the news when he comes back. You can get good grades if you study hard. Be careful when you cross the road.eg：The train leaves at six tomorrow.4.表示按计划或安排好将要发生的动作，用一般现在时表将来。但仅限start, begin, leave, go, come, arrive 等。3.用在以if，unless，as soon as, when, once 等引导的时间和条件状语从句中，用一般现在时表将来（主将/情/祈从现）1. 频度副词：always、usually、often、sometimes、never、hardly…2. 频率词组： once/twice/three times a week3.其他词组：in the morning, on Sundays/everyday/year…1.主语+am/is/are2. 主语+do/doeseg：We went to Beijing last week.1.表示过去某个时间里所发生的动作或存在的状态。2.表示或反复发生的动作，与频度副词连用。eg：When I was a child, I often played basketball in |
