excuse,find,found,go,has,help,is,join,know,learn,let,的单三,现在分

excuses,excusing,excused;
finds,finding,found;
founds,founding,founded;
goes,going,went;
has,having,had;
helps,helping,helped;
is,being,was;
joins,joining,joined;
knows,knowing,knew;
learns,learning,learned或learnt;
lets,letting,let;
likes,liking,liked;
listens,listening,listened;
looks,looking,looked;
losts,losting,lost;
loves,loving,loved;
meets,meeting,met;
needs,needing,needed.