33. of the day, of a day

of the day每一天的,當時的,當代的;
of a day暫時的,不長久的 eg:a famous scientist of the day

34. three of us, the three of us

three of us我們(不止三個)中的三個;
the three of us我們?nèi)齻€(就三個人)eg:The three of us---Tom, Jack and I went to the cinema.

35. by bus, on the bus

by bus表手段,方式,不用冠詞;
on the bus表范圍 eg:They went there by bus.

36. for a moment, for the moment

for a moment 片刻,一會兒;
for the moment暫時,一時 eg:Thinking for a moment, he agreed.