A. The problem is (that) he doesn't have common sense. :: you can leave out 'that'; but including it gives the sentence a greater feel of clarity and objectivity.
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tenjingA. The problem is (that) he doesn't have common sense.When a that-clause is a subject complement, we hardly ever omit 'that' except in very casual situations.
tenjingAre these sentences correct? ?A. He is angry with you after what you did to him.(used noun clause after a preposition)b. He stood before me.c. He is after me
tenjingA. Who do you think (that) you are?B. Who did he say (that) you are?C. Who did you believe (that) will be the next president?My recommendation is to leave out 'that' in all of these. In fact, it's impossible to use 'that' in the last one because the initial "Who?" is the subject of "will be". You can't have another subject ("that") as well.