The grammatical form employed here is the present progressive.

The plural form of "louse" is "lice".

The future progressive tense is used when expressing events and action in progress at some future point, however the example sentence cannot be understood in that way.

In the official question collection it is explained as being "passive voice of the present continuous tense".

It is even becoming accepted even in exam-English that that called "simple future tense" does not exist.

In a progressive tense sentence it becomes the -ing form verb, that is the present participle.

The example is a past progressive tense sentence. How was everybody taught when they were learning about progressive tense?

This sentence is in the present perfect. 'have' is not a verb, but an auxiliary verb.

"Past tense" is used in connection with actions in the past.

I say "should", because theses written in the present tense are still seen around and about.

In many languages the way dictionary-form words end is fixed; in Japanese they end in a 'u row' character.

I read about how to make tempura in a book.

A good businessman knows how to make money.

I appreciate your problem, but it can't be helped.

The choice of clothes has become conservative.

When one is sick, visitors can be rather annoying.

She told me how to swim.

She taught me how to make a web site.

They differed with each other on the care and upbringing of their children.

He did not die happily.