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I wonder if someone could explain to me when to use 'as' or 'has', the difference between the two. Thank you.
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Comments  (Page 3) 

What about this saying, as my .other used to say or has my mother uses to say

as my mother used to say >>>>'as' here means 'like. in the way that.

has my mother used to say >>>> This is just nonsense. There is no meaning.

Clive

Thank you! very informative, I adore English, it's a wonderful language.

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I think what he meant by in capacity of is to describe the extent or degree at which something is done. E.g she is as tall as a tree.

This shows the extent at which she is tall.

She is as tall as tree is not capacity it’s comparison