to be knowledgeable about ...
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to keep abreast of …
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to know one's way about
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to have a thorough knowledge of sth
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to know one's onions
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to be well grounded in sth
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to be clear about sth
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to be given notice of
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to have a thorough knowledge of sth
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to have someone on the tape
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to think highly of sb
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to have low (poor) of sb
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to know something inside out
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to know something backwards
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to look at something
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to have secret c a of the enemy's plans
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to be a difficult man to place
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