最新初中英语各个时态的句子结构及标志词
1.概念：一般现在时用于描述经常或反复发生的动作或行为，以及当前的某种状态。动词使用原形，但如果主语是第三人称单数，则动词需要变成第三人称单数形式。
2.标志词：always。usually。often。sometimes。every week (day。year。month。)。once a week (day。year。month。)。XXX。
3.肯定形式：主语+动词原形+其他（如果主语是第三人称单数，则动词变为第三人称单数形式）
4.否定形式：主语+am/is/are+not+其他；如果谓语动词是行为动词，则使用：主语+do+not+动词原形+其他。如果主语是第三人称单数，则使用：主语+does+not+动词原形+其他。(is not缩写:isn’t。are not缩写:aren’t。does not缩写: doesn’t。do not缩写: don’t)
5.一般疑问句：be+主语+其他？Do/Does+主语+其他？
6.例句:
1.我经常在家吃饭。I often have dinner at home.
我不经常在家吃饭。I don’t often have dinner at home.
你经常在家吃饭吗？Do you often have dinner at home?
2.XXX喜欢唱歌。XXX singing.
XXX不喜欢唱歌。XXX’t like singing.
XXX喜欢唱歌吗？Does Tom like singing?
3.他总是准备着去帮助别人。He is always ready to help others.
他不总是准备着去帮助别人。He is not always ready to help others.
他总是准备着去帮助别人吗？Is he always ready to help others?
二、一般过去时
1.概念：一般过去时用于描述过去某个时间发生的动作或状态，以及过去的惯性或经常性的动作或行为。动词使用过去式。
2.时间状语：yesterday。the day before yesterday (前天)。last week。last (year。night。month。)。时间词+ago (two years ago)。in/on+表示过去的时间词 (in 1989)。just now (刚才)。at the age of 5 (5岁时)。
3.肯定形式：主语+动词过去式+其他。
4.否定形式：主语+did not+动词原形+其他。
5.一般疑问句：Did+主语+动词原形+其他？
6.例句：
1.昨天我在家吃饭了。I had XXX at home XXX.
我昨天没有在家吃饭。I didn't have XXX at home XXX.
你昨天在家吃饭了吗？Did you have dinner at home yesterday?
2.我小时候常常在公园玩。I used to play in the park when I was a child.
我小时候不经常在公园玩。I didn't use to play in the park when I was a child.
你小时候常常在公园玩吗？Did you use to play in the park when you were a child?
3.我两年前去过日本。I went to Japan two years ago.
我两年前没有去过日本。I XXX't go to Japan two years ago.
你两年前去过日本吗？Did you go to Japan two years ago?
现在，此刻，正在，目前，这几天，这个月，这一年，等等。
3.肯定形式：
主语+am/is/are+现在分词+其他。
4.否定形式：
主语+am/is/are+not+现在分词+其他。
5.一般疑问句：
Am/is/are+主语+现在分词+其他？
weigh的过去式例句：
1.I am studying English now.我现在正在研究英语。
I am not studying English now.
Are you studying English now?
2.XXX.他们此刻正在打篮球。
XXX.
XXX?
Now。at this moment。or currently。there are several phrases that indicate the present time。When using affirmative sentences。the structure is subject + be verb + present parti
ciple + other words。For negative sentences。the structure is subject + be verb + not + present participle + other words。In asking ns。the be verb is placed at the beginning of the sentence。For example。"Are they going to have a n with us in studies?"
There are certain verbs that do not require the present participle form。These include verbs that describe a fact or state。such as have。belong。possess。cost。owe。exist。include。contain。matter。weigh。measure。XXX describe a mental state。such as know。realize。think。see。believe。suppose。imagine。agree。recognize。remember。want。need。et。prefer。mean。understand。love。and hate。also do not require the present participle form。Verbs that describe a sudden n。such as accept。receive。complete。finish。give。allow。decide。and refuse。do not require the present participle form either。Finally。verbs that describe a state of being。such as seem。remain。lie。see。hear。smell。feel。taste。get。e。and turn。do not require the present participle form.

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