There ____ some spelling mistakes in your exercises

題目：

There ____ some spelling mistakes in your exercises
a.seems to be b.seem to be
選B?爲什麼?

解答：

主謂一致的問題
首先名詞才能做主語
而there be的句型和其類似句型中 there是地點副詞,副詞是不能做主語的
there are many people
主語應該是many people,正確語序應該是many people are there.
而之所以倒裝是應爲 這是一種習慣.
所以這題主語應該是mistakes,主謂一致選B