原形	过去式	原形	过去式
am  /is	was	are	were
can	could	get	got
say	said	tell	told
become	became	go	went
come	came	swim	swam
bring	brought	see	saw
drink	drank	sweep	swept
take	took	draw	drew
make	made	fly	flew
have/has	had	meet	met
do	did	find	found
lose	lost	hear	heard
catch	caught	eat	ate
wear	wore	give	gave
write	wrote	read	read
drive	drove	buy	bought
put	put	sing	sang
sit	sat	teach	taught
ride	rode	run	ran
keep	kept	begin	began

原形	过去式	原形	过去式
am  /is	was	are	were
can	could	get	got
say	said	tell	told
become	became	go	went
come	came	swim	swam
bring	brought	see	saw
drink	drank	sweep	swept
take	took	draw	drew
make	made	fly	flew
have/has	had	meet	met
do	did	find	found
lose	lost	hear	heard
catch	caught	eat	ate
wear	wore	give	gave
write	wrote	read	read
drive	drove	buy	bought
put	put	sing	sang
sit	sat	teach	taught
ride	rode	run	ran
keep	kept	begin	began