结构词主要包括：

冠词：a，an，the

介词：at，for，from，to，of等

连词：and，as，but，that，than，or，so等

代词：you，he，him，her，us，them，your，me，their，our等

助动词：be，am，are，was，were

情态动词：must，can，shall，will，have，has等

弱读式与强读式的区别主要有三个方面：

(1)元音不同：

单词：强读式 弱读式

the [Ti:] [TI](元音前) or [TE](辅音前)

for [fC/er)] [fE(r)]

do [du:] [dJ](元音前) or [dE](辅音前)

an [En] [En]

can [kAn] [kEn]

than [TAn] [TEn, Tn]

have [hAv] [hEv, Ev]

has [hAz] [hEz, Ez, z]

shall [FAl] [F(E)l]

at [At] [Et]

was [wCz] [wEz]

of [Rv] [Ev] [(?@) C:f]

from [frRm] [frEm]

to [tu:] [tu, tE]

does [dQz] [dEz]

must [mQst] [mEst]

but [bQt] [bEt]

us [Es] [Qs]

that [TAt] [TEt]

you [ju:] [ jJ, jE]<

as [Az] [Ez]

some [sQm] [ sEm, sm]

such [sQtF] [ sEtF]

should [Fud] [FEd, Fd]

(2)原有的元音或辅音脱落：

am [Am] [Em, m]

and [And] [En, n]

he [hi:] [I:]

is [iz] [z] (在浊音后) or [s] (在清音后)

him [him] [im, Em]

(3)元音的长度不同：

me [mi:] [mI]

you [ju:] [jJ]

been [bi:n] [bin]