В пособии рассматриваются основные моменты английской грамматики: части речи имя существительное, имя прилагательное и наречие; видо-временные формы глагола; модальные глаголы; неличные формы глагола

farther and further
Both words are used to refer to distance, with no difference of meaning:
London is farther/further than Paris.
Further (but not farther) can also be used, mainly with abstract nouns,
to mean ‘additional’, ‘extra’, ‘more advanced’.
College of Further Education.
Finally, they reached the furthest point in the dicussion.
elder, eldest; older, oldest
Elder and eldest are chiefly used for comparisons within a family.
Note the difference between elder and eldest.
My elder son is the older of my two sons; if I say my eldest son, I probably
have at least three sons. If I say my elder sister, I only have one sister. But
elder is not used with than, so older is necessary here:
My elder brother is two years older than I am.


C. Use of comparative and superlative
1. The comparative is used to compare things or people that are separate
from each other. The superlative is used to compare one member of a
group with the whole group (including that member):
Mary’s nicer than her three sisters.
Mary’s the nicest of the four sisters in the family.
In the first sentence, Mary is not one of the three sisters; we use the
comparative. In the second sentence, Mary is one of the four girls that we
are talking about; we use the superlative.


Note that after superlatives we use in with places (towns, buildings etc.)
What’s the longest river in the world?
We live in one of the nicest rooms in the hotel.
Also: in the class/in the team/in the family etc.
Tom is the best player in the team.
But: the happiest day of my life, the most pleasant season of the year
2. We sometimes use the comparative instead of the superlative to talk
about a group that only has two members.
I like Betty and Maud, but I think Betty’s the nicer of the two.
I’ll give you the bigger steak: I’m not very hungry.
3. After the superlative we often use the present perfect tense.
It’s the best book I’ve ever read.