the cake my mother made yesterday were delicious怎解

正如你所說The cake my mother made yesterday were delicious應改為was，因為the cake是指一個蛋糕，若你不想改用was，則cake就要變成cakes，但意思與cake不同，不是一個，而是多過一個。
My mother made delicious cake for me on yesterday，這句應改為
My mother made a delicious cake for me yesterday.（cake是可數名詞，所以要加上冠詞，或用眾數形；而yesterday與today, tomorrow等都不用on帶出）
The cake my mother made yesterday was delicious，其實全句應是”The cake (that) my mother made yesterday was delicious”是一句complex sentence，句中用了that-子句，但that可以被省略，所以這是兩句子句組成的複合句子(complex sentence)，因此可以有兩個動詞。
最後：the cake my mother made yesterday were delicious不可改為My mother made a delicious cake for me yesterday，因為意思不同the cake my mother made yesterday were delicious是：昨天媽媽弄的蛋糕很美味
而My mother made a delicious cake for me yesterday是：昨天，媽媽弄了一個美味的蛋糕給我。
這樣解釋，希望你明白！


2007-10-25 10:24:26 補充：
The cake my mother made yesterday is delicious. 由was改為is又怎解釋? 是解作：昨天母親所弄的蛋糕很美味（但因為用了is，所以是表示：現在都十分美味）

The cake my mother made yesterday were (應用was) delicious
→ The cake my mother made yesterday was delicious
‧此句主語是 cake
‧主句是 the cake was delicious

My mother made (應加a)delicious cake for me on (應取消on) yesterday
→ My mother made a delicious cake for me yesterday
‧此句主語是 mother
‧主句是 my mother made a cake

兩句表達的主要意思有不同，視乎上文下理如何配合使用

我媽媽昨天造的蛋糕很好吃。
The cakes my mother made yesterday were delicious.

Cakes 為眾數, 因後面用 were.

改後的句子 "My mother made delicious cake for me on yesterday. "
應刪去 on, 加上 a .
My mother made a delicious cake for me yesterday.

我媽媽昨天弄的餅很美味