I have made up the sentences below.
(1a) I'll be here for part of next week.
(1b) I'll be here for all of next week.
(1c) I'll be here all next week. (wrong)
(2a) I'm here for part of this summer.
(2b) I'm here for all of this summer.
(2c) I'm here all this summer. (wrong)
(3a) There will be many celebrations for part of April.
(3b) There will be many celebrations for all of April.
(3c) There will be many celebrations all April. (wrong)
My non-native English speaking friends think the sentences with "for" are all correct. I don't understand what's wrong with my sentences without "for". Please explain this. What is your opinion? Thanks very much.
(1a) I'll be here for part of next week. OK. (1b) I'll be here for all of next week.
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(1a) I'll be here for part of next week. OK.
(1b) I'll be here for all of next week. OK.
(1c) I'll be here all next week. (wrong) OK.
(2a) I'm here for part of this summer. OK.
(2b) I'm here for all of this summer. OK.
(2c) I'm here all this summer.