Some auxiliary verbs, such as can, may, has, am, were, and are; does not affect could, might, ought, shall, should, will, and would

一些助动词，如 can、may、has、am、were 和 are；但不影响 could、might、ought、shall、should、will 和 would

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The lights can flicker, which could set off epileptic fits, and badly made ones might leak ultraviolet radiation, and may thus pose a cancer risk.

此种灯会有闪烁现象，引发癫痫，制作质量差的还会泄露紫外线，导致癌症。

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