Después de tender la colada, me gusta doblar las camisetas con calma.

Because después de is a fixed expression meaning after and it must be followed by:

• a noun: después de la cena
• or an infinitive: después de tender la colada

So después tender is incorrect because de is missing, and después de tiendo is incorrect because after de you do not use a conjugated verb here.

A useful pattern is:

• después de + infinitive = after doing...

Example:

• Después de comer, descanso.
• Después de tender la colada, me gusta doblar las camisetas.

In Spain, tender la colada means to hang up the laundry to dry.

Here:

• tender = to hang out / spread out
• la colada = the washing / the laundry

So this is very natural in Peninsular Spanish. It refers to the moment when you take the wet clothes and hang them on a clothesline, drying rack, etc.

In other contexts, English speakers may know tender as to tend or to offer, but in this sentence it has the laundry meaning.

Not exactly.

• la ropa = clothes / clothing in general
• la colada = the laundry, especially the washing you have done or need to do

So:

• Tengo que lavar la ropa = I have to wash the clothes
• Tengo que hacer la colada = I have to do the laundry

In this sentence, la colada sounds more natural than la ropa because the speaker is talking about laundry as a household task, not just clothes in general.

Because gustar works differently from English to like.

Spanish structure is closer to:

• me gusta doblar las camisetas = folding the T-shirts is pleasing to me

So:

• me = to me
• gusta = is pleasing

You need the pronoun me with gustar:

• me gusta = I like
• te gusta = you like
• le gusta = he/she likes

So gusto doblar is not correct for I like folding.

Because the thing being liked is the action doblar las camisetas, and an infinitive counts as a singular idea.

So:

• Me gusta doblar las camisetas.
  = I like folding T-shirts.

But if the thing being liked is a plural noun, then you use gustan:

• Me gustan las camisetas.
  = I like T-shirts.

Compare:

• Me gusta cocinar. → I like cooking.
• Me gustan las camisetas azules. → I like blue T-shirts.

Because after gustar, when you say you like doing something, Spanish uses the infinitive.

Pattern:

• me gusta + infinitive

Examples:

• Me gusta leer.
• Me gusta cocinar.
• Me gusta doblar las camisetas.

So doblar means to fold, and the sentence is saying the speaker likes that activity.

Spanish often uses the definite article more than English does, especially when talking about things in a general or familiar way.

So:

• doblar las camisetas sounds very natural
• English often prefers fold T-shirts or fold the T-shirts, depending on context

In Spanish, las camisetas can refer to the T-shirts involved in the laundry you are dealing with, even if English would not always explicitly say the.

This is very common:

• Me lavo las manos = I wash my hands
• Cierro los ojos = I close my eyes

Spanish likes the article where English often uses a possessive or no article.

Because con calma is a very natural and common expression meaning:

• calmly
• slowly
• without rushing

It is often more idiomatic than using an -mente adverb.

So:

• doblar las camisetas con calma = to fold the T-shirts calmly / at a relaxed pace

calmadamente exists, but it is less common in everyday speech here. Native speakers often prefer:

• con calma
• tranquilamente
• sin prisa

It is very natural and usually recommended because the sentence begins with an introductory phrase.

So:

• Después de tender la colada, me gusta doblar las camisetas con calma.

This helps separate the time phrase from the main clause.

In informal writing, some people might omit it, but with a fronted phrase like this, the comma is standard and makes the sentence easier to read.

Yes. That is grammatically correct.

• Después de tender la colada...
• Después de haber tendido la colada...

Both mean after hanging up the laundry.

The version with haber + past participle is a bit more explicit about the action being completed first. But in everyday Spanish, the simple infinitive version is usually more natural and more common.

So the original sentence sounds better in ordinary conversation.

No. Tender has several meanings, but in everyday Spain Spanish, one very common use is with laundry.

Examples:

• tender la colada = to hang up the laundry
• tender la ropa = to hang up the clothes

It can also mean to spread out or to lay out, depending on context. But in a sentence like this, learners should strongly associate it with laundry.

Yes, camisetas usually means T-shirts.

Singular:

• la camiseta = the T-shirt

Plural:

• las camisetas = the T-shirts

In Spain, this is the normal everyday word for a T-shirt. It can also sometimes mean a sports shirt or jersey depending on context, but here it simply means T-shirts in the laundry.

Yes, it sounds natural and idiomatic in Spain.

Especially natural features are:

• tender la colada
• me gusta + infinitive
• con calma

A native speaker in Spain would easily understand it and could very naturally say it. It has a relaxed, everyday household-task feel.