Our plan is to keep the affair secret.这个句子是主系表结构吗?

题目

Our plan is to keep the affair secret.这个句子是主系表结构吗?
如果是主系表结构,is是系动词,to keep the affair secret是表语还是keep the affair secret是表语?

答案

此句如楼主所说为主系表结构
Our plan主语
is连系动词
to keep the affair secret.表语（动词不定式作表语）