There are 4 questions in my test.<br/><br/>1. There is not <u>a</u> train until tomorrow. <br/><br/>(Should I change "a" into "any" because the sentence is negative?)<br/><br/>2. Can I start a sentence with "not any" since I can do so with "not a/one"? <br/><br/>for example: Not <u>one/a</u> single person remembered my birthday.<br/><br/>3. Are they both correct?<br/><br/>(3.1) Above the door <u>there was</u> a sign saying, "Mind you heard".<br/><br/>(3.2) The disease has now spread <u>throughout</u> the island.