collecting,since,years,ten,oid,was,he's,been,matches,he 连词成句

collecting collecting I have been collecting shell for5years可以改成 I have been collecting shell since 5yearsago吗?为什么? I've been collecting them since I was 5 years old 怎样提问可以when did you start collecting them? yea high yea high BOb has been collecting kites__?A since 4 years agoB since he was ten years oldC for 4 years I have been collected shells since Isaw her.和I have been collecting shells since I saw her哪个对? Jack has been collecting coins since two year ago.（用how long提问.） I have been collecting kites ( since two years ago)?对括号内的部分提问 I____(collect）stamps since I was ten year是been collecting吗、 I started collecting coins when I was thirty.(用since改写） I have been collecting sells since 2008.（改为否定句） I started collecting coins when I was thirty.(用since改写) 连词成句：collecting,since,years,ten,old,was,he's,been,matches,he collecting,since,years,ten,oid,was,he's,been,matches,he 连词成句 has watches collecting grandfather young he his been old since was连词成句 I have been collecting stamps since I was 7.Now I am 12.（合并为一句）I _____ _____ collecting stamps _____ _____ _____.