1）當(dāng)there be 句型的主語(yǔ)是一系列事物時(shí)，謂語(yǔ)應(yīng)與最鄰近的主語(yǔ)保持一致。

There is a pen， a knife and several books on the desk..

There are twenty boy-students and twenty-three girl-students in the class.

2）當(dāng)either… or… 與neither… nor，連接兩個(gè)主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞與最鄰近的主語(yǔ)保持一致。 如果句子是由here， there引導(dǎo)，而主語(yǔ)又不止一個(gè)時(shí)，謂語(yǔ)通常也和最鄰近的主語(yǔ)一致。

Either you or she is to go.

Here is a pen， a few envelops and some paper for you.