Englishfor English speakers
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
mental
Adjective
—
Mental health, processes etc. is related to the mind and thinking.
The program helps people deal with drinking, depression and other mental health problems.
Some diseases can cause severe mental and physical damage to the unborn baby.
Manville made a mental note of the cab's licence number.
block
Noun
—
A block is a hard piece of material, usually with six smooth sides.
When I was young, I liked building things with wooden blocks.
—
A city block is the distance from one road to the next.
We have to walk about three blocks to the restaurant.
—
In computers, a block is a restriction that prevents access to something.
I could not start a page on Wikipedia because of a block.
block
Verb
—
If mathX/math is blocking mathY/math, then mathY/math can't go past mathX/math.
The water in the bath won't go down. There's something blocking the drain.
The road was blocked by police.
Excuse me! You're blocking my view. I can't see.