Spanish language Q&A Forum

The lesson says:

We always use the singular form of verb gustar when followed by actions!

For example: Me gustan bailar y cantar.

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I think I understand the answer, but the example seems confusing since in this case gustar is being used with multiple verbs

There doesn’t seem to be an example or text relating to placement in a tense with auxiliary ‘ha’ etc. I gather from the quiz question that you cannot interpose  nunca as in ‘no he nunca visto eso’. As this is the natural order in English (I have never seen that) it would be good to have some explicit mention in the text and examples. 

I’m not quite clear about the use of the ‘se tardan’ plural. The examples given are with a plural number of hours/minutes. Are the time units the ‘subject’ of the passive?  In other words if the time was one hour or one minute, could you still use the plural verb? Or is there some other rule that indicates singular or plural?  Or are they just equivalent?