Il kiwi è acidulo, ma a mia sorella piace molto.

In Italian, nouns are often used with a definite article more frequently than in English, especially when talking about something in a general or typical sense.

So Il kiwi è acidulo means something like Kiwi is tart or The kiwi is tart.

A few notes:

• kiwi is masculine singular here, so it takes il
• the plural would usually be i kiwi
• in everyday Italian, using the article with foods is very common

È with an accent means is.

It is the 3rd person singular of essere:

• io sono = I am
• tu sei = you are
• lui/lei è = he/she is

The accent is important because:

• è = is
• e = and

So:

• Il kiwi è acidulo = The kiwi is tart
• Il kiwi e la pera = The kiwi and the pear

Acidulo means slightly acidic, tart, or somewhat sour. It often sounds a bit softer or more nuanced than acido.

Roughly:

• acido = sour / acidic
• acidulo = tart / a little sour / slightly acidic

So acidulo is a natural choice for describing the taste of fruit.

Also, acidulo agrees with il kiwi, which is masculine singular:

• il kiwi è acidulo
• la mela è acidula

That a is there because of how piacere works.

Italian piacere does not work like English to like. A more literal way to think of it is:

• Something is pleasing to someone

So:

• a mia sorella piace molto = it is very pleasing to my sister

That is why the person who likes something is introduced by a:

• a me = to me
• a te = to you
• a mia sorella = to my sister

Because piacere has a different structure from English to like.

Compare the two:

• English: My sister likes kiwi
• Italian structure: Kiwi pleases my sister

So in Italian:

• the thing liked is the grammatical subject
• the person who likes it is an indirect object

That is why the sentence is:

• Il kiwi ... a mia sorella piace molto

And not something built like English mia sorella piace il kiwi, which would mean something more like my sister pleases the kiwi, and makes no sense.

Because piacere agrees with the thing that is liked.

Here, the thing being liked is il kiwi, which is singular, so you use piace.

Examples:

• Il kiwi piace a mia sorella. = My sister likes kiwi.
• I kiwi piacciono a mia sorella. = My sister likes kiwis.

So:

• singular thing liked -> piace
• plural thing liked -> piacciono

With singular family members, Italian usually omits the article before the possessive adjective.

So you normally say:

• mia sorella = my sister
• mio fratello = my brother
• mia madre = my mother

Not usually:

• la mia sorella

A common exception is when the family term is modified or used in a special way, for example:

• la mia sorella maggiore = my older sister

But in the basic form, mia sorella is the normal choice.

Italian word order is more flexible than English. The phrase a mia sorella is often placed before piace to make the structure clear and natural.

So this part:

• a mia sorella piace molto

is a very normal order.

You could also hear:

• Il kiwi è acidulo, ma piace molto a mia sorella.

That also works. The difference is mostly one of emphasis and rhythm:

• a mia sorella piace molto slightly highlights to my sister
• piace molto a mia sorella sounds a bit more neutral in some contexts

Here molto modifies piace, so it means a lot / very much.

• piace molto = likes it a lot / it pleases her a lot

It does not mean very tart here, because it comes after piace, not after acidulo.

Compare:

• Il kiwi è molto acidulo. = Kiwi is very tart.
• A mia sorella piace molto. = My sister likes it a lot.

Yes, in a sense. Italian often leaves out subject pronouns or repeated subjects when they are understood from context.

In:

• Il kiwi è acidulo, ma a mia sorella piace molto

the subject of piace is still il kiwi, understood from the previous clause.

A more explicit version would be:

• Il kiwi è acidulo, ma a mia sorella esso piace molto.

But that sounds unnatural. Italian normally leaves that pronoun out.

So English needs it, but Italian usually does not:

• ...but my sister likes it a lot
• ...ma a mia sorella piace molto

Normally, no.

You say a mia sorella, not alla mia sorella, because with singular family members Italian usually does not use the article before the possessive:

• a mia sorella
• a mio fratello

If you include the article, it is usually because the noun is modified or used differently:

• alla mia sorella minore = to my younger sister

So in this sentence, a mia sorella is the correct and natural form.

Yes, often you could.

• ma = but
• però = however / but

For example:

• Il kiwi è acidulo, ma a mia sorella piace molto.
• Il kiwi è acidulo, però a mia sorella piace molto.

Both are natural. In many everyday contexts they are very similar, though ma is the most straightforward simple conjunction here.