It is あ that い

It is あ 疑問詞+S' V' い

It is あ to do い

It is あ for い to doう

It takes（+人）+あ時間+to doい

It costs（+人）+あ金額+to doい

it follows that あ

It is+あ距離（+from い ）to う

It has been [is] あ since い+過去形う

It+be動詞 あ before[until] い

It won't be long before [until] あ

seem [appear] to doあ

learn to do あ

come[get] to doあ

tend to doあ

manage to doあ

used to doあ / would (often) doあ

be about to doあ

be said to doあ

be thought to doあ

be reported to doあ

may(might) well do(あ)

keep (on) doing(あ)

助動詞 + have + 過去分詞

too + 形容詞/副詞(あ) + to do(い)

形容詞/副詞(あ) + enough to do(い)

in order to do(あ)/so as to do(あ)

cannot afford to do(あ)

行動を促す動詞(tell order ask) + あ to do(い)

(encourage persuade) + あ to do(い)

make あ do(動詞の原形)(い)

have あ do(動詞の原形)(い)

let あ do(動詞の原形)(い)

help あ to do(い)

知覚動詞う + あ do(い)

あ only to do(い)

あ never to do(い)

be to do (あ)

疑問詞あ + to do(い)

have no choice but to do(あ)

have something to do with(あ)

by doing(あ)

without doing(あ)

in doing(あ)

on doing(あ)

instead of doing(あ)

look forward to doing(あ)

あ is worth doing(い)