Your use of "one of the uses" in this case is fine. By "the simple form of 'be' as a principal verb," are you referring to "am, is, are, was, were"? We are lying down.
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AvangiBy "the simple form of 'be' as a principal verb," are you referring to "am, is, are, was, were"?Yes I am. Is it wrong?
AvangiI'd like to hear other comments on "the simple form of 'be' as a principal verb."I would assume that the quoted expression is the same as "any non-continuous form of 'be' as a principal verb". I assume it would include such constructions as The keys were in the living room, but not The keys were being in the living room, for example.
Thinking SpainOne of the uses of the simple form of 'be' as a principal verb is:It looks like two uses to me.
a) To inform about a position.
b) To inform about a physical condition.