to不定詞でtoを省略できる できない動詞

❶ 必ず to が必要な動詞
動詞例文
wantwant + to VI want to go to Tokyo.
hopehope + to VWe hope to arrive early.
decidedecide + to VShe decided to study abroad.
planplan + to VThey plan to start next week.
expectexpect + to VI expect to finish by Friday.
promisepromise + to VHe promised to help me.
refuserefuse + to VShe refused to answer.
needneed + to VYou need to check this.
would likewould like + to VI would like to order coffee.
learnlearn + to VHe learned to drive last year.
offeroffer + to VShe offered to carry the bag.
choosechoose + to VWe chose to wait.

❷ 省略(bare infinitive)が可能な動詞・状況
動詞 / 状況例文
助動詞(can, will, must など)modal + VShe can speak English.
make(使役)make + O + VThey made him apologize.
let(許可)let + O + VLet me try.
have(使役)have + O + VI had him fix the car.
see / hear / watch / feel / notice(知覚動詞)see O V / see O V-ingI saw him leave. / I saw him leaving.
let’s(let us の短縮)let’s + VLet’s go!
had better / would ratherhad better + V / would rather + VYou had better go now. / I’d rather stay home.

to を付けても付けなくてもよい動詞・表現
動詞 / 表現例文
helphelp + (to) VShe helped me (to) carry the box.
go(慣用表現)go (to) VI want to go (to) see that movie again.
come(慣用表現)come (to) VCome (to) see me tomorrow.
try(イディオム的表現)try (to) VTry (to) open the door.
daredare (to) VHe didn’t dare (to) speak.
need(否定・疑問)need (to) VYou needn’t (to) worry.
know(口語的に稀)know (to) VI know (to) sing this song.(やや不自然だが可能)