| 5000 Vocabulary List for Visiting Scholars in the USA - Page 272 | |||
| Word | Type | Used in a Sentence | Synonym |
| idiom | noun | Learning idioms is not easy. | slang |
| idiot | noun | Anyone who thinks that is an idiot. | fool |
| idle | adj. | He was idle most of the time. | lazy |
| verb | They idled the afternoon away. | wasted | |
| verb | He idled the engine of the car. | ran slowly | |
| i.e. | abbr. | He was a Chinese citizen, i.e. PRC. | that is |
| if | conj. | You can go if you want to go. | on condition |
| conj. | Ask if he will come. | whether | |
| ignite | verb | A spark can ignite flammable gas. | explode |
| ignorance | noun | Ignorance cost more than education. | illiteracy |
| ignorant | adj. | They were ignorant of the danger. | unaware |