第1个回答 2012-05-23
do--did--be doing--does
play--played--be playing--plays
go--went--be going--goes
have--had--be having--has
be--was/were--am/is/are
visit--visited--be visiting--visits
stay--stayed--be staying--stays
come--came--be coming--comes
clean--cleaned--be cleaning--cleans
practice--practiced--be practicing--practices
put--put--be putting--puts
sit--sat--be sitting--sits
begin--began--无进行时--begins
bring--brought--be bringing--brings
sting--stinged--be stinging--stings
cook--cooked--be cooking--cooks
stop--stopped--be stopping--stops
eat--ate--be eating--eats
book--booked--be booking--books
watch--watched--be watching--watches