Let's consider the worst that could happen.

When you're trying to prove something, it helps to know it's true.

Making light of cavities can be a matter of life and death.

When you wear camo shorts, what colour t-shirt goes with that?

One of the early noticeable symptoms is trouble with urination, but often there are no clear symptoms.

And how will you take responsibility in the case that this bill doesn't pass?

When one goes to the notary public's office, the following are required.

Then, when you're making CG, how should you use light sources?

If you frequently spit-up blood you should call an ambulance or have a nearby physician make a house call.

When you swallow a dangerous substance, what you need to do depends on what you swallowed.

For rock it's hard to know on what basis you should call something 'hi-fi'.

On some OS's you get gibberish for filenames with full-width characters so when downloading please change to a suitable filename.

What's different from Japan is that the doctors of Singapore generally all know each other.

It is sometimes acceptable to resort to violence.

Depending on the case; sometimes it is so, sometimes not.

With the subjunctive past all the 'be' verbs become 'were', OK?

When the antecedent is this, that, these or those it is usual to use 'which'.

We use "present tense" for this kind of case.

Actually, there are many cases where 'have [object] done' is not causative.

When indicating 'tense' in Chinese, as shown above, there are 'particles', 'time-specifying words' and also many cases where it depends on context.