murat guler said:
Why do "who-which-what" always treated as singular in subject questions in this tense?
***** NOT A TEACHER *****
Hello, Murat Guler:
I want to congratulate you on an excellent question. As you know, some moderators and teachers have already given you the answers.
*****
I only wanted to add a few comments (not "answers") to the conversation.
1. Some native speakers do use a plural form after, for example, "Who" in certain circumstances.
2. Here is what one reliable English usage book says:
a. "In everyday speech we commonly use a singular verb ... even when we are asking for a plural answer: Who is coming tonight? John and Sally are."
b. "However, plural verbs can occur nataurally after subject questions."
i. He gives these examples:
(a) Who are playing in the orchestra?
(b) Who have won Nobel Prizes for literature in the past two years?
*****
In my opinion, there seems to be a difference between "Who help
s you when you need help?" and "Who
have won Nobel Prizes for literature?" In the second sentence, the speaker (and the listener) would naturally be thinking of more than one person.
James
Source: L.G. Alexander,
Longman English Grammar (1988) published by Longman (London and New York).