ｔｅｎｓｅ

Tｈｉｓ　ｍｏｒｎｉｎｇ係過去式！
咁即係visited！

我教您呀!
見到句子有a while ago , yesterday , last weeknd , two day ago , last Sunday , this morning , when he was young , once upon a time , one day ,我地要用過去式（past tense)
見到句子有always , usually , often , sometimes , seldom , never , every day , every month,every year , all the time , 我地要用現在式（present tense)
見到句子有now , at present , while , at the moment,我地要用現在進行式（present continuous)
所以，個條橫線填visited啦！

visited

"this morning"一定係指過去，所以會用過去式，即係visited
至於幾時用shall，當然係指將來發生的事，例如：tomorrow (明天)、next Sunday (下星期日)，緊記shall之後的動詞係不變，即shall visit

Answer:
I ___visited___ (visit) my aunt this morning.

The event (e.g. visit your aunt) should be happened earlier than now! That's why "This morning" usually uses PAST tense!

If it will be happened in the FUTURE, we should write the sentence as:
I ___will visit___ my aunt later / tomorrow.

In fact, "Shall" is not very appropriate in the meaning.

Ｉ　＿visit＿（ｖｉｓｉｔ）　ｍｙ　ａｕｎｔ　ｔｈｉｓ　ｍｏｒｎｉｎｇ．


咁點知佢過左未，？？
you can see that"this "
that means it happens today.
So it is not we want to tell the things in the past.

If you want to point out the time and that you have finished this action
already. Then you may say:

I ----have visited------ my ａｕｎｔ　ｔｈｉｓ　ｍｏｒｎｉｎｇ.
Then you will use persent perfect tesen.

If you say
未過就ｓｈａｌｌ
IBut I think it is ok but not the best.

I think this will be better.
I ---will visit---- my aunt ..

think the sentence may have a little change.
eg.
Ｉ　＿＿will visit＿＿＿（ｖｉｓｉｔ）　ｍｙ　ａｕｎｔ　in the 　ｍｏｒｎｉｎｇ．

Do you agree?

過左就ｖｉｓｉｔｅｄ．．．
this form for simple past tense is correct.

2007-06-14 17:34:45 補充：
Sorry for the typing mistake of the first sentence :It should be Ｉ　＿****visited***＿（ｖｉｓｉｔ）　ｍｙ　ａｕｎｔ　ｔｈｉｓ　ｍｏｒｎｉｎｇ．咁點知佢過左未，？？you can see that this moringthat means it happens in today's moring.It usually say after you did the eventsSo we want to tell the things in the past.

應該係visited
據我所知，逢有this morning就99.99%(=100%)都係past tense
Hope this can help you.