Therewasadininghallnourschoolfiveyearsago否定？
一、解析
首先否定句是 There was not / wasn't a dining hall in our school five years ago.然后句意是：五年前我们学校里面没有食堂。因为这句话有be动词was，was是is的过去式，所以否定句在be动词后面加not即可，即was not或者缩写为wasn't，其他的照搬。所以否定句是 There was not / wasn't a dining hall in our school five years ago.（五年前我们学校里面没有食堂。）
二、拓展——变句思路
（1）有 be ，be后面加 not
例一： He was a doctor my uncle .（他是一名医生）
这句话里面有be 动词 was，否定句在 be 动词 was 后面加not，was not 可以完整写，也可以缩写为 wasn't
即 否定句：He was not / wasn't my uncle .（他不是我的叔叔。）
（2） 有 can，can后面加 not
例二： She can sing .（她会唱歌，）
这句话里面有情态动词 can，所以否定句在can 后面加 not ，can not 可以完整写，也可以缩写为 can't
即 否定句：She can not / can't sing .（她不会唱歌。）
（3）无 be 无 can找实意动词，前面加don't 或 doesn't或didn't，此时动词需要还原
例三： She wanted to go to the park .（她想要去公园。）
这句话 wanted判断句子一般过去时，所以实意动词 wanted 前面加入找动词 didn’t ，动词还原为want
即 She did not / didn't want to go to the park.（她不想去公园。）
（4） and 变成 or，some 变成 any 。
例四：I can do some housework.
这句话里面有情态动词can，否定句情态动词can后面加not，也可以缩写成can't，some变成any，
即 I can't / can not do any housework （句意：我不会做家务）
三、拓展训练
1 She was in the park yesterday .（她昨天在公园里。）
否定句：She was not / wasn't in the park yesterday.（她昨天不在公园里。）
2 She liked cats two years ago.（两年前她喜欢猫。）
否定句：She didn't / did not like cats two years ago.（两年前她不喜欢猫。）
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