Перефразируйте предложения, используя модальные глаголы в страдательном залоге.
Пример: We divide the metalworking processes into five broad groups.- The metalworking
processes can be divided into five broad groups
1.It is easy to deform metals into useful shapes.
2. Hot-rolling eliminates porosity in metals.
3. Coining involves small strains.
4. Hot working provides the improvement of mechanical properties of metals.
5. Sheet metal forming includes forging, bending and shearing.
6.We carry out bending through pressing a part between two dies.

During many centuries people all over the world can't imagine their lives without friendship. Friend - is a person, who helps and supports you in any situation/ It is a well-known fact, that practically every person on the Earth found his friends at school/ So why school friendship can be constant?
I personally feel that school ages are the perfect time to make friends. Only then you can live without problems and responsibilities. You can communicate with contemporaries  and get pleasure from it. By the way, children can detect lie and meanness better than adults. That is why, friendship in such a young age is the most sincere.
 But when you grow up, you find new interests, new priorities and old friends lose value in your eyes. Moreover,you and your friends can choose different life's roads and this fact destruct your relationships at all. 
But instead of all facts, you shouldn't forget about the idiom "A friend is never known till needed." No matter how and where you met your friend: at school or university, pab or cafe, you will always detect :your" person, who will be your anchor during the whole life.

A white rose is more beautiful than a red one.
A white rose is the most beautiful flower I have ever seen.
My granny is wiser than my mother.
My granny is the wisest person I have ever met.
Tom is younger than Sam.
Tom is the youngest boy in our team.
Ann is better at English than Kate.
Ann is the best at English in our form.
A pen is thicker than a pencil.
An oak is the thickest tree in our forest.
My sister is neater than me.
My sister is the neatest in our family.
A bush is lower than a tree.
A mimosa bush is the lowest in my garfen.
New Year day was merrier than my birthday party.
New Year day was the merriest holiday in the year.
A puppy is noisier than a kitten.
My puppy is the noisiest in our yard.