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发音<br>上齿轻触下唇<br>声带不震动<br><br>单词<br>face fact fail <br>fall family far <br>feel few find <br>safe self staff <br>first follow for<br>brief chief relief <br>forget form from<br>offer office often <br>after before forever<br>enough laugh tough <br><br>句子<br>I feel safe.<br>We should follow way. <br>The first offer is good.<br>The family are from France.<br>There is enough room in the office.<br><br>同音<br>flew flu<br>for four <br>fin Finn<br>fair fare<br>feet feat<br>few phew<br>flour flower<br>foul fowl<br>forth fourth <br><br>辨音<br>[f] [v]<br>fan van<br>fat vat<br>fast vast<br>file vile<br>ferry very<br>leaf leave<br>life live<br>safe save<br>belief believe<br>proof prove