1
(1) If I (had) a smartphone now, I (could) look up the word.
(2) It was (such) (an) inspiring movie (that) it excited my imagination.
※so+形容詞・副詞(…) that+S+V~/such (a/an)+形容詞+名詞(…) that+S+V~ とても…なのでSが~する
(3) Astronauts excise for two hours every day (so) (that) they can keep fit in space.
※so that+S+can+V~ Sが~することができるように
(4) We can eat some junk food (in) (case) (that) we don't eat too much.
※in case that+S+V~ もしSが~する場合には
2
(1) (If it were not for the air conditioner in summer), I couldn't sleep.
※if it were not for … もし…がなければ
(2) (If it had not been for the ice age), dinosaurs might not have died out.
※if it had not been for … もし…がなかったならば
(3) Some sumo wrestlers eat six meals a day (so that they can gain weight).
(4) Brush your teeth (the way the dentist told you to).
※the way = how(関係副詞)+S+V~ Sが~する方法
3
(1) If the meteor should hit the earth, what would happen to human beings?
(2) I was wondering if you could lend me your tablet computer.
≒ Could you lend me your tablet computer?
(3) The teacher advised that he (should) study(原形) physics harder.
4
(1) He talks as if he had traveled in space. ※現実:He has never traveled in space.
(2) I would appreciate it if you would pay my tuition.
※I would appreciate it if you would ~. もしあなたが~してくださると有難いのですが
(3) This application software can be used by not only adults but also children.
(4) As she is a strong walker, she walks to school.
参考にしてください。
ありがとうございます。
①1-(4)は、ちょっと固い表現ですが、可能だと思います。
ただ、問題の例文の書き換えとしては、as long as の方が良いかも知れません。
②確かに、2-(2)にはifがありませんね。
Had it not been for the ice age が正解です。
ご指摘、ありがとうございました。
勉強になります。