➡️ 文法ジャンル別の解き方
TOEIC Part5「不定詞」の解き方と頻出パターン｜練習10問つき
不定詞の問題は、to do を目的語にとる動詞や形容詞、「〜するために」の目的の表現を問います。動名詞を目的語にとる動詞との区別がよく狙われます。
解き方のポイント
- to do を目的語にとる動詞：plan / decide / hope / agree / refuse / afford / intend
- be able to / be likely to / be eager to / be pleased to などの形容詞＋to
- 目的「〜するために」は to do / in order to do / so as to do
- 名詞を後ろから修飾：the decision to expand（拡大する決定）
- too ~ to do（〜すぎて…できない）/ enough to do（…するのに十分）
ひっかけ注意
- enjoy / finish / consider / avoid / postpone は -ing をとる（to do ではない）
- remember / forget / stop は to do と -ing で意味が変わる
- in order to の後ろは原形
例文で確認
| The company plans to open a new store next year. | plan to do |
| Staff arrived early in order to prepare the venue. | 目的 → in order to |
| We are pleased to announce the winners. | be pleased to do |
練習問題（10問）
選択肢をタップすると正解がわかります。動画では先生が解答と解説をしてくれます。
Q1. Sales representatives are expected ___ their monthly targets consistently.
答えと解説を見る
正解: C) to meet
'Expect' takes the pattern 'expect A to do', and in the passive that becomes 'be expected to do'. So 'to meet' is correct. 'Meet' is the base form, 'meeting' is a gerund/present participle, and 'met' is the past form/past participle — none fit this construction. 'Be asked to' and 'be required to' follow the same pattern.
Q2. The company plans ___ three new branches in the region next year.
答えと解説を見る
正解: C) to open
'Plan' is a verb that takes a to-infinitive as its object (plan to do), so 'to open' is correct. 'Open' is the base form, 'opens' is third-person singular, and 'opened' is past/past participle — none of these can be the object of 'plans'. Other verbs with the same pattern include decide, hope, want, and agree — worth memorizing as a group.
Q3. Visitors are not permitted ___ photographs inside the research facility.
答えと解説を見る
正解: C) to take
'Permit' takes the pattern 'permit A to do', and in the passive that becomes 'be permitted to do'. So 'to take' is correct. 'Take' is the base form, 'taking' is a gerund/present participle, and 'taken' is a past participle. 'Be allowed to' and 'be expected to' follow the same pattern.
Q4. The coach encouraged the team ___ harder during the final practice.
答えと解説を見る
正解: D) to train
'Encourage someone' is followed by an infinitive: 'to train'.
Q5. The staff were told ___ the building by the rear exit.
Q6. The catalogue was updated ___ reflect the newly acquired manuscripts.
Q7. The Stanton Group agreed ___ the conference next year.
Q8. Mr. Kim came to the office early ___ the report.
Q9. The Harwood Group hopes ___ its sales by 10 percent.
Q10. The board voted ___ the merger proposal.