Hi.
We should all help the poor.
What is the form and function of the underlined part?
To me, it's an adverb in form class and functions as a modifier of 'help'.
See the section "All as an adverb" here. org/us/grammar/british-grammar/quantifiers/all When all refers to the subject of a clause, it usually comes in the normal mid position for adverbs (between the subject and the main verb, or after the modal verb or first auxiliary verb, or after be as a main verb): The kids all go to school on the same bus. These items could all have been bought cheaper on the Internet.
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See the section "All as an adverb" here.
http://dictionary.cambridge.org/us/grammar/british-grammar/quantifiers/all
When all refers to the subject of a clause, it usually comes in the normal mid position for adverbs (between the subject
Persian Learnerfunctions as a modifier of 'help'
It's got nothing to do with 'help'. It goes with 'we'.
"We ... all" is the same as "All of us", but "all" gets shifted to the right in this construction.
[We should all / All of us should] help the poor.
Note that "all", in spite of being displaced, is within the subject territory of