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Come - came - come
play - played - played
go - went- gone
see - saw - seen
do - did - done
understand - understood - understood
fly - flew - flown
buy - bought - bought
think - thought - thought
catch - caught - caught
like- liked - liked
be - was - been
leave - left- left
get - got- got
sing - sang- sung
drop - droped - droped ?
eat - ate-eaten
dance - danced - danced
write - wrote - written
Надеюсь правильно ответила, на счёт некоторых не уверенна, но хоть что-то)

Нет, не исчесляемые  
Дети мебель еда счастье точно не исчесляемые

Skiing 
Skating 
Snowboarding
Ice skating
Boxing
Dancing

-were living- т.к. это действие длительное в прошлом. 
( если неверно,сорян)