what is the correct verb of the sentence "Be sure there(is,are)no erasures on the thesis.

Which word is the subject of the sentence? Once you know that, you'll choose the verb correctly.

http://grammar.ccc.commnet.edu/grammar/sv_agr.htm
and
http://grammar.ccc.commnet.edu/grammar/subjects.htm#inversion

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The correct verb for the sentence "Be sure there(is,are) no erasers on the thesis." is "are."

The correct verb to use in the sentence "Be sure there (is, are) no erasures on the thesis" is "are."

To determine the correct verb choice, you should consider subject-verb agreement. In this case, the subject is "there," which is often used as a placeholder for the actual subject of the sentence. Since "there" is followed by a plural noun ("erasures"), it indicates that multiple erasures are being referred to. Therefore, the correct verb form to agree with the plural subject is "are."

You can confirm this answer by asking yourself: "What is being described in terms of being erased?" If the answer is "erasures," indicating a plural noun, then the correct verb form is "are."

By understanding subject-verb agreement and analyzing the sentence's structure, you can determine the correct verb form for sentences like this one.