他们去年是牙医们.肯定句 否定句 疑问句 答句（Yes、No）

They were dentists last year 肯定句
They weren't dentists last year 否定句
were they dentists last year? 疑问句
yes,they were / No,they weren't

They were dentists last year.
They weren't dentists last year.
Were they dentists last year?
Yes,they were.
No,they weren't.
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肯定句 They were dentists last year.
否定句 They weren't dentists last year.
疑问句 Were they dentists last year?
答句 Yes,they were .
No,they weren't
）

They were dentists last year.
They weren't dentists last year.
Were they dentists last year?
Yes,They were dentists last year.
No,They weren't dentists last year.