介词
介词后要么不加动词，加动词只能加动词ing形式
如：be good at running;
do well in jumping;
时间介词
季节前，月份前用介词in
如：in summer；in March
具体的哪一天如星期几，几月几日用介词on
如：on Saturday; on the second of April; on Wednesday morning
在几点钟前用介词at
如：at a quarter to four;
只在上下午晚上用in
如：in the morning/ afternoon/ evening;
但在夜间用at night。
另：季节，月份和星期前不好加the.
名词复数构成的方法
有规则的有：
(1)直接在名词后加s
如orange—oranges; photo—photos;
(2) 以x, s, sh, ch 结尾的加es
如：box—boxes; glass—glasses; waitress—waitresses; watch—watches;peach–peaches
(3) 以辅音字母加y结尾的改y为i加es
如：study—studies；library—libraries; hobby—hobbies; family—families;
(4)以f, fe结尾的改f, fe 为v＋es如：knife—knives; thief—thieves（注:以o结尾的我们学过的只有mango加es, mango—mangoes其余加s,）
不规则的有：
man—men; woman—women; people—people; child—children
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;
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;
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;
形容词副词比较级的构成
规则的：
(1)直接在形容词或副词后加er
如；small—smaller; low—lower;
(2)以e结尾的加r
如：late—larer;
(3)双写词尾加er
如：big—bigger; thin—thinner; fat—fatter;
(4) 以辅音字母加y结尾的改y为i加er
如：heavy—heavier; early—earlier;
不规则的有：
good, well—better(最高级为best); many, much— more(最高级为most); far—farther;
