Convincedofthetruthofthereport,hetoldhiscolleaguesaboutit.
Disappointedatfallinginthedrivingtest,Johnwouldn'tliketotalkwithanyoneelse.
这两句为什么开头用convinced和disappointed而不用toconvince和tobedisappointed
——Wherehaveyoubeenallthetime?
——IcamebackatnoonandIhaveinthisroomsince.
这里为什么用since、它可以单独这样用吗、为什么呢?
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