前回は that 補文が4つのタイプに分かれると言った。再び、あげると
(1)
a. I regret that you had not told the truth.
b. I realize that you had not told the truth.
c. I said that it has just started to rain.
d. I doubted that it has just started to rain.
(1a) は補文の付加疑問文はできないが、 (1b) の補文の付加疑問文は問題ない。
(2)
a. *I regret that you had not told the truth, had you?
b. I realize that you had not told the truth, had you?