1.是的.用一個例子概括你看：
以你要求的幾種時態(tài)的虛擬語氣：我要是在這兒就好了.
現(xiàn)在時：If only I were here.
過去時：If only I had been here.
將來時：If only I would be here.
動詞向前推一個時態(tài).
2.不對,還可以用who,whom,whose,只不過可以省略
比如：
.--where is your english book?just see what a mess in your schoolbag!
--The one whose cover is red,it’s easy to find anyway .
The one (whom)you referred to is my son. 你指的那個人是我兒子
The one (that) you bought is much better.你買的那個比較好.
這里面省略了做賓語的引導詞that /which/who(m),
3.不是,比如：I'm feeling better nwo.我現(xiàn)在感覺好點了.feel不就是用正在進行了.
相信我,我是英語六級,英語老師,嘿嘿.