Togli la coperta dal letto se hai caldo.

Togli is the tu imperative of togliere, which means to remove, to take away, or to take off.

So here Togli la coperta... means Remove the blanket... or Take the blanket off...

A useful point: for many -ere and -ire verbs, the tu imperative looks exactly like the normal tu present form, so togli can mean either you remove or remove! depending on context.

Italian often leaves out subject pronouns when they are already clear from the verb form.

So instead of saying Tu togli la coperta, Italian normally just says Togli la coperta.

Adding tu is possible, but it usually gives extra emphasis, contrast, or impatience, such as You take the blanket off.

Because Italian usually uses the article with a specific, identifiable thing.

• la coperta = the blanket
• coperta without an article would sound less natural here

Also, coperta is a feminine singular noun, so it takes la.

Dal is a contraction of da + il.

• da = from
• il letto = the bed
• dal letto = from the bed / off the bed

This kind of contraction is very common in Italian:

• da + il = dal
• da + lo = dallo
• da + la = dalla
• da + i = dai
• da + gli = dagli
• da + le = dalle

Because togliere often follows the pattern:

togliere qualcosa da qualcosa

which means:

to remove something from something

So:

• Togli la coperta dal letto = Remove the blanket from the bed
• more naturally in English, often Take the blanket off the bed

The preposition da shows the place something is being removed from.

In Italian, being hot in the sense of feeling hot is expressed with avere, not essere.

So:

• avere caldo = to feel hot
• hai caldo = you are hot / you feel hot

This is similar to other common expressions:

• avere freddo = to be cold
• avere fame = to be hungry
• avere sete = to be thirsty

If you say sei caldo, that usually does not mean you feel hot in the normal everyday sense. It can sound odd, or mean that your body is physically warm, and in some contexts it can even suggest something sexual.

Because in the expression avere caldo, caldo does not change according to the person's gender.

So you say:

• to a man: Hai caldo
• to a woman: Hai caldo

The same happens with:

• Hai freddo
• Hai fame
• Hai sete

These are fixed expressions, so you do not change caldo to calda here.

Se means if.

It introduces the condition:

• se hai caldo = if you are hot / if you feel hot

So the sentence has this structure:

• Togli la coperta dal letto = main action
• se hai caldo = condition

In other words: do this action if that condition is true.

Yes, absolutely.

Both are correct:

• Togli la coperta dal letto se hai caldo.
• Se hai caldo, togli la coperta dal letto.

Putting se hai caldo first may feel a little more natural in some contexts, because the condition comes before the command. But both word orders are normal Italian.

The rest of the sentence stays mostly the same, but the verb forms change.

To one person informally:

• Togli la coperta dal letto se hai caldo.

To one person formally:

• Tolga la coperta dal letto se ha caldo.

To more than one person:

• Togliete la coperta dal letto se avete caldo.

So the main things that change are the verb forms for togliere and avere.