That's　a　rather　difficult　question,　but　（maybe）　…

I'm　sorry,　but　I　don't　know　much　about　…

However,　it　might　be　possible　that　…

Maybe　I　can　answer　your　question　by　telling　you　about　a　personal　experience　I　had.

That's　an　interesting　question　…

Let　me　see.　Well,　I　suppose　that　…

Well,　I　think　there　are　2　（or　3　or　more）　reasons:

First,　…　Second,　…　Finally,　…

In　my　opinion　there　are　three　ways　of　looking　at　it:

First　of　all,　…　Next,　…　Then,　…

Have　I　given　you　enough　information?

Would　you　like　me　to　tell　you　more　about　…？

Is　that　all　you'd　like　to　know?

I'm　afraid　that's　about　as　much　as　I　know.

I　think　that's　about　it.

I　can't　think　of　anything　else　right　now　…

更多口语学习方法及资料，请点击雅思口语