I collect shells because they are beautiful.为什么前面用的是“collect”,是不是一般现在时?怎么说它是一般现在时态的？

I collect shells because they are beautiful.I'd like to collect stamps because they are interesting 模仿句型写一段话.I collect shells because they are beautiful.I'd like to collect stamps because they are interesting I collect shells because they are beautiful.为什么前面用的是“collect”,是不是一般现在时?怎么说它是一般现在时态的？ 英语在海边拾贝壳 collect shells ___________ shells I found her a hard-working girl 改为复合句I found ____ ______ ______ a hard-working girlIt is gerat fun to collect stamps (改为感叹句)____ _____ ______ it is to collect stanps Why do you like to collect shells (改为同义句）____ do you 英语翻译my opinion on you is the same.^-^ Btw collecting shells at the beach is fun,but where I live there are not many different shells to collect.even if we did meet and didnt know what the other was saying,I think we would both have fun.And I They collect everything from books to butterflies and from shells to stamps .翻译 They collect everything from books to butterflies and from shells to stamps . mike started to collect shells four years ago ,改为现在完成进行时mike ___ ___ collecting shells for four years. 3.He started to collect shells about 4 years ago.( 用for about 4 years 替换4 years ago) I would like to collect shells [because they are beautiful]对划线部分提问I have been collecting pens for 5 years.改为同义句I have been collecting pens----- 5 years-------.Leo started to swim about five years ago.改为现在完成进行 I would like to collect shells [because they are beautiful]对划线部分提问.I have been collecting pens for 5 years.改为同义句I have been collecting pens----- 5 years-------.Leo started to swim about five years ago.改为现在完成进行 I have been collected shells since Isaw her.和I have been collecting shells since I saw her哪个对? I have been collecting shells for three years.和 I have collected shells for three years.在语法和意 What do you collect?-I collect ball game ( ) collect collect