【論点6：節の「S-V-X構造」におけるCの拡張】

① The trouble is that he is not at all smart. ② The question is who is going to tell him. ③ The probability is that the talks will be held before June. ④ This is where I used to work. ⑤ That is why I came here. ⑥ That is how it happened. ⑦ What do you know of the reasons for birds’ migration? All that we can say at present is that the impulse to migrate is something birds are born with. ⑧ The test of a great book is whether we want to read it only once or more than once.