Ultimate English Grammar Guide: Present Simple Tense, Plural Nouns, Possessives & Prepositions

1. The Present Simple Tense: Habits and Facts

The Present Simple is used to talk about things that happen regularly (habits and routines), facts that are always true, and general states of being. It is not used for things happening right now.

Rule 1: Affirmative Sentences and the "Third-Person S"

For most subjects (I, You, We, They), you use the base form of the verb. However, if the subject is He, She, or It (the third-person singular), you must add an -s or -es to the end of the verb.

Rule 2: Negative Sentences (Don't vs. Doesn't)

To make a negative sentence, you need an auxiliary (helper) verb. We use do not (don't) or does not (doesn't) before the main verb. Crucial rule: When you use "doesn't," the main verb loses its "s".

Rule 3: Questions (Do vs. Does)

To ask a question, start the sentence with Do or Does, followed by the subject, and then the base verb.

2. Singular and Plural Nouns: Spelling Rules

A singular noun names one person, place, or thing. A plural noun names more than one. While most nouns just need an "s" at the end, English has several strict spelling rules you must follow.

Rule Exception: Irregular Plurals

Some nouns completely change their spelling instead of adding an "s". These must be memorized!

3. The Possessive 's: Showing Ownership

We use an apostrophe combined with an "s" ('s) to show that something belongs to someone. The placement of the apostrophe changes depending on whether the owner is singular or plural.

Rule 1: Singular Nouns

If the noun doing the owning is singular (just one person or thing), always add an apostrophe followed by an "s" ('s).

Rule 2: Regular Plural Nouns

If the noun doing the owning is plural AND already ends in "s" (like boys, teachers, dogs), you only add the apostrophe (') at the very end. Do not add another "s".

Rule 3: Irregular Plural Nouns

If the noun is plural but does not end in an "s" (like children, men, people), treat it like a singular noun and add an apostrophe "s" ('s).

4. Basic Prepositions of Place: In, On, Under

Prepositions of place tell us exactly where someone or something is located in relation to something else.

• IN (Inside / Enclosed): Use "in" when an object is surrounded or enclosed on all sides. Used for boxes, rooms, buildings, cities, and countries.

  The keys are in my pocket.
  We are sitting in the living room.
  She lives in Tokyo.

• ON (Surfaces): Use "on" when an object is resting on top of a flat surface. Used for tables, walls, floors, and roads.

  The book is on the desk.
  There is a beautiful painting on the wall.
  Don't leave your clothes on the floor.

• UNDER (Beneath / Below): Use "under" when an object is covered by something else or is in a lower physical position.

  The cat is hiding under the bed.
  I found my shoes under the table.
  We stood under a tree to stay dry from the rain.

5. Demonstratives Review: Pointing Out Objects

Demonstratives (This, That, These, Those) are used to point out specific items. You must apply two rules at the same time to choose the correct word: Number (is it one item or many?) and Distance (is it near you or far away?).