【HELP】When for, with or by are not used, as in the last example, it can be difficult to tell whether the person or thing mentioned is being used, or has been replaced by somebody or something else. The context will usually make this clear.
• 像最后一个例句这种情况,由于 for、with 或 by 均不出现,可能难以断定所说的人或事物是在使用的,还是被取代的,通常上下文能使意思明了。