16、动词第三人称单数的构成

　　(1)直接在动词后加s

　　如：run—runs; dance—dances

　　(2)以s,sh,ch,o结尾的加es

　　如：do—does;go—goes;wash—washes;catch—catches

　　(3)以辅音字母加y结尾的改y为i加es

　　如：study—studies; carry—carries;

　　17、现在分词的构成

　　(1)直接在动词后加ing

　　如：sing—singing; ski—skiing;

　　(2)双写词尾加ing

　　如：swim—swimming; jog—jogging;run—running;

　　(3)以不发音的e结尾的去e加ing

　　如：ride—riding; dance—dancing; make—making;

　　18、规则动词过去式的构成

　　(1)直接在动词后加ed

　　如：clean—cleaned; milk—milked; play—played;

　　(2)以e结尾的直接加d

　　如：dance—danced; taste—tasted;

　　(3) 以辅音字母加y结尾的改y为i加ed

　　如：study—studied;carry—carried;

　　(4)双写词尾加ed

　　如：stop—stopped; jog—jogged;

　　不规则的有：am,is—was; are—were; do,does—did; have,has—had; go—went; meet—met; sit—sat; see—saw; get—got; tell—told; run—ran; come—came; steal—stole; read—read;
 

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