Page 640 - Practical English Usage 3ed - Michael Swan, Oxford

weak and strong fonns 616 Contracted negatives always have a strong pronunciation.
can't Ika:ntl mustn't /,mAsntl wasn't /'wozntl 3 list of words with weak and strong forms
The most important words which have weak and strong fonns are:
a
am an and are as
at
be been but can could do does
for from had has have he her him his is must not of our
saint
shall
she
should
sir
some (see 546) than
that (conj.) the
them
there (see 586) to
us was we were
Weakfonn
lal I(a)ml
lanl l(a)n(d)1
la(r)1 lazl latl IbII Ibml Ibatl Ik(a)nl Ikadl Id(a)1 Idazl Ifa(r)1 Iframl l(h)adl I (h)azl l(h)avl
1(h)II
I (h)a(r)1
I(h)Iml
l(h)IZI
Iz, sl
Im(a)s(t)1
IntI
lavl
la:(r)1
Is(a)ntl (BrE only) II(a)ll
IJI/
II(a)dl
Isa(r)1 Is(a)ml l(j(a)nl l(j(a)tl l(ja, (jII l(j(a)ml l(ja(r)1 Ital lasl Iw(a)zl IWII Iwa(r)1
Strong fonn leII (unusual)
I~ml
I~nl (unusual) I~ndl
la:(r)1
I~zl
Imtl
Ibi:1
Ibi:nl
IbAtl
Ikmnl
Ikudl
Idu:1
ldAzl
Ifo:(r)1
Ifroml
Ihmdl
Ihmzl
Ihmvl lhi:1 Ih3:(r)1 IhIml IhIZI IIZI ImAStl Inotl IDVI laua(r)1 Isemtl IImll IIi:1
IIudl IS3:(r)1 ISAmI l(jmnl (rare) l(jmtl
IOi:1
l(jeml l(jea(r)1 ltu:1 IASI lwozl
Iwi:1 IW3:(r)1
page 608