When there is not a lot of rain, riverbeds often have no flowing water.
这个 not a lot of 用得对吗?
a lot of 完全可用于否定句:
When there is not a lot of rain, riverbeds often have no flowing water.
句意:雨水不多时,河床经常没有流水。
根据所修饰名词是否可数,not a lot of 大致相当于 not many 或 not much:
Not a lot of people [=Not many people] know that. 没几个人知道那件事。
There isn’t a lot of [=not much] call for small specialist shops nowadays. 如今对小型专卖店已没有多大需求了。
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