lingling and lucy often ride bikes together.Bob and I clean

Lingling and Lucy often ride bikes together.
否定句：Lingling and Lucy don't often ride bikes together.
疑问句：Do Lingling and Lucy often ride bikes together?
回答：Yes,they do./ No,they don't.
Simon and Tony like going skating.
否定句：Simon and Tony don't like going skating.
疑问句：Do Simon and Tony like going skating?
回答：Yes,they do./ No,they don't.
Class begins.
这是个“主谓”句,主语是class；谓语是begins,没有宾语,因为begin是不及物动词.
这是简单句中最简单的一种句子模式.

否定句就是 like前面加don't
疑问句就是 do simon and tony like going skating?
yes ,they do
no ,they don't

class begins不就是主谓么

不知道你什么意思，可以明确点么？