Fields have eyes, and woods have ears.

隔墙有耳。

Fire and water have no mercy.

水火无情。

Fire is a good servant but a bad master.

火是一把双刃剑。

First come, first served.

先来後到。

First impressions are half the battle.

初次见面，印象最深。

First think and then speak.

先想後说。

Fools grow without watering.

朽木不可雕。

Fool's haste is no speed.

欲速则不达。

Fools has fortune.

呆人有呆福。

Fools learn nothing from wise men, but wise men learn

much from fools.

愚者不学无术，智者不耻下问。

Forbidden fruit is sweet.

禁果格外香。

Fortune favors those who use their judgement.

机遇偏爱善断之人。

Fortune knocks once at least at every man's gate.

风水轮流转。