这个蛋糕是我奶奶做的。
This cake was made by my grandmother.
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was英 /wɒz/|美 /wɑz/
made英 /meɪd/|美 /meɪd/
by英 /baɪ/|美 /baɪ/
解释
was + made + by 构成被动语态：主语 cake 是动作承受者（被做），by 引出施动者 grandmother（谁做的）。
This cake was made by my grandmother.
was + made + by 构成被动语态：主语 cake 是动作承受者（被做），by 引出施动者 grandmother（谁做的）。