1）當there be 句型的主語是一系列事物時，謂語應與最鄰近的主語維持一致。
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either or 與neither nor，連接兩個主語時，謂語動詞與最鄰近的主語維持一致。 假如句子是由here, there引導，而主語又不止一個時，謂語一般也和最鄰近的主語一致。
Either you or she is to go.
Here is a pen, a few envelops1 and some paper for you.
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either or 與neither nor，連接兩個主語時，謂語動詞與最鄰近的主語維持一致。 假如句子是由here, there引導，而主語又不止一個時，謂語一般也和最鄰近的主語一致。
Either you or she is to go.
Here is a pen, a few envelops1 and some paper for you.