Doubt means you don’t know whether something is true or will be possible.

It does NOT mean that you are uncertain about something, or don’t know it, or don’t know what to do.

Examples:

I’m not sure what to say. (NOT I doubt what to say.)

If your teacher says something that isn’t clear, say There’s something I don’t understand or I have a question (NOT I have a doubt).

Weeds never die

This refers to the fact that weeds are often resilient although generally unwanted. They grow or multiply rapidly even in poor conditions.

This is a famous saying in Spain referring to bad people and vermin to point out that evil dies hard.

Both of these words correspond to Spanish HACER.

The basic difference:

do– is used for actions; usual word with work; used with your best, business, damage, your duty, an exam, a favour, good, harm a TEST, work

make– has the idea of producing or creating; is used with these words: an appointment, arrangements, an attempt, a bed, the best of, certain, a choice, a complaint, a decision, a discovery, an effort, an exception, an excuse, ...

This one reproaches the person who has advice for everyone except for himself. Also, some people would do well by heeding the excellent advice they so generously extend to others.

“Tell me who your friends are and I’ll tell you who you are.”

I guess everyone is aware that this refers to a person’s character and tastes by noting who his friends are and in what circles he moves. Also, we’re reminded that whom to choose as friends is not a matter to be taken lightly, as the people we socialize with won’t fail to influence us, good or bad.

This expression in Spanish literally means “In a blacksmith’s house, a wooden spoon”

This means that in the place where it would be most expected to find something, it’s often absent. This idiom means the same with “a shoemaker’s son always goes barefoot“

The Spanish word pareja means two different things and yes, one of them is couple.

But couple refers to two things seen as ONE UNIT.

I went out with a couple (un par) of friends.

Leo has a couple of dogs. 

If you’re talking about the one person you share your life with, that is the other meaning of pareja, your partner.

I went out with my partner. (NOT I went ...

Many people make mistakes by saying that someone is a good cooker. Please don’t say that to someone. Cooker is the apparatus in the kitchen you use for cooking and the person who cooks is a cook.

Buses used to have conductors as well as drivers. The conductor went round the bus collecting money and selling tickets while the driver was driving it.

Also, an orchestra has a conductor, who stands in front of the musicians and CONTROLS what they are playing.

Conduct is another word for behaviour, Spanish conducta.