Optional.
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PhilipOptional.Thanks a lot, Philip!
ExeAll are optional and would be incorrect if 'for' was included. Also, they need a question mark at the end.Thanks but how can they be optional and incorrect at the same time?
ExeSorry, it's been a long day. I meant all are incorrect, not all are optional.No problem, and thanks. But the sentences are correct without (for) though, right?