Don't use "for" in the sense of "about". The chief use of "about" is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!
Place the preposition "for" before words or phrases denoting a period of time: for three days, for six weeks, for two years, for a few minutes, for a long time. Use it with any tense except the present.
Note: "For" is often omitted. We can say: I've been here for two years or I've been here two years.
Place the preposition "since" before words or phrases denoting a point in time: since Monday, since yesterday, since eight o'clock, since Christmas. When we use since, the verb is usually in the present perfect tense, but it may be in the past perfect: I was glad to see Tom. I hadn't seen him since last Christmas.
Note: "From" can also denote a point in time, but it must be followed by "to" or "till": He works from eight o'clock till one o'clock without a break.
TO and AT Use TO for movement from one place to another. Example: I walk to school every day. Use AT to denote position or rest. Example: He's waiting at the door.
IN and INTO IN denotes position or rest inside something. Example: The pencil is in the box. INTO denotes movement towards the inside of. Example: They walk into the room.
Prepositions of Time:
AT, IN, ON Use AT with the exact time. Example: She arrived at 8 o'clock in the morning. Use ON with days and dates. Examples: On Sunday we go to church. My birthday is on the third of December. Use IN with a period of time. Example: In summer the weather is warm.
In the first person: ✖️Don't say: I will go tomorrow if it's fine. ✔️Say: I shall go tomorrow if it's fine.
In the second person: ✖️Don't say: She tells me you shall go tomorrow. ✔️Say: She tells me you will/'ll go tomorrow.
In the third person: ✖️Don't say: He shall go if he has permission. ✔️Say: He will/'ll go if he has permission.
(b) To express something more than simple futurity:
In the first person: ✖️Don't say: I have determined that I shall go. ✔️Say: I have determined that I will/'ll go.
In the second person: ✖️Don't say: You will/'ll go out if you are good. ✔️Say: You shall go out if you are good.
In the third person: ✖️Don't say: My mind is made up: he will/'ll go. ✔️Say: My mind is made up: he shall go.
To form the simple future, use "shall" with the first person and "will" with the second and third persons. "Will" in the first person denotes resolution or personal determination, and "shall" in the second and third persons denotes either a command or a promise.
Note: "Should", the past tense of "shall", and "would", the past tense of "will", have the same differences of meaning and use as the present forms "shall" and "will": I was afraid that I should fail. I promised that I would help him.
✖️Don't say: He told, 'I will/'ll go home.' He told that he'd go home.
✔️Say: He said, 'I will/'ll go home.' He said that he'd go home.
Use "to say" (1) when referring to a person's actual words, and (2) in indirect speech if the sentence doesn't contain an indirect object.
Note: Common idioms with "say" and tell: Say a prayer. Who says? I must say! You can say that again! If you say so! Tell the truth. Tell a lie. Tell a story. Tell the time. Tell your fortune. Tell someone your name.
(a) Make ✖️Don't say: The carpenter did a large table. ✔️Say The carpenter made a large table.
(b) Do ✖️Don't say: You must make your work carefully. ✔️Say: You must do your work carefully.
"To make" primarily means to construct or manufacture something, while "to do" mean to accomplish a thing.
Note: Common exceptions with make and do: (a) To make a mistake, to make a promise, to make a speech, to make an excuse, to make haste, to make fun of, to make progress, to make a noise, to make a bed(= to prepare the bed for sleeping on) (b) To do good, to do evil, to do your best, to do your duty, to do someone a favour, to do wrong, to do a puzzle, to do business, to do away with, to do gymnastics, to do exercises.
(a) Sit ✖️Don't say: We seat at a desk to write a letter. ✔️Say: We sit at a desk to write a letter.
(b) Seat ✖️Don't say: He sat the passengers one by one. ✔️Say: He seated the passengers one by one.
Use "sit" as an intransitive verb. "Seat" is a transitive verb and requires an object. Very often the object of "seat" is a reflexive pronoun: He seated himself near the fire. The principal parts of the two verbs are: sit, sat, sat, and seat, seated, seated.
Note: Don't confuse "sit" with "set", which usually means: to place. Common idioms with "set": to set the table, to set on fire, to set off (or out), to set a trap, to set a clock, to set a price, to set your heart on, to set free, to set an example, to set a broken bone, to set to work (= to start work).
(a) Rise ✖️Don't say: Val raises very early in the morning. ✔️Say: Val rises very early in the morning.
(b) Raise ✖️Don't say: She rose their salaries too often. ✔️Say: She raised their salaries too often.
"Rise" is an intransitive verb and means to go up, stand up, or get out of bed. It doesn't require an object. Raise is a transitive verb and means to lift up something. Their principal parts are: rise, rose, risen, and raise, raised, raised.
Note: "Arise" is often used for "rise", but it is better to use arise only in the sense of begin :A quarrel (a discussion, an argument, a difficulty, etc.) may arise. This is formal but is still used.