The plural is fine. For a group of individuals you can either use the singular if you want to emphasise the group (single entity), or the plural if you want to refer to all of the people (multiple entities) that make up the group. Cheers

Welcome, Annushka You can post any questions about English that you may have. Volunteers will then answer them if and when they can. Cheers John.

The a with an accent symbol above it is not in use in English. Fractions are usually written out (e.g. "a fifth", "a quarter") when the context is not mathematical. It's hard to tell what are headings and what is "body" text. You need some

It means to be very happy. As it happens, I just read the (possible) explanation for this expression the other day in Bill Bryson's book A Short History of Nearly Everything . It seems that an 1896 edition of a meteorology book called

Your interpretation of the meaning is correct. The full idomatic expression is "If you talk the talk, you've got to walk the walk", but this is often shortened in the manner shown in your example. If you search Google for "walk the walk"

Oh no! Guest is right. Lease is a fixed term at a fixed price. Rent is until cancelled by either party. They are most definitely not synonyms.

Your question is not clear. What do you wish to know?

Both are incorrect. There's no such word as "sth".

"needed money" is fine. Often "much-needed" is used for emphasis. Needful is not in common use nowadays. John.

Watch out would be better. It has the connotation of general awareness of a threat. Look out is more like physically keep your eyes open for some event. Having said that, they tend to be used interchangeably. It's subtle.