1. At can indicate location

Pattern 1: at + the + place within a city or town
The women are at the supermarket.

Nouns commonly used with this pattern:
apartment, bus stop, factory, hospital, hotel, house, mall, office, park, parking lot, restaurant, station, store, theater, university

Pattern 2: at + an address
She lives at 3757North 52nd Street, apartment 10.
You can contact him by e-mail, @xyz.com (The symbol @ is pronounced ''at.")

Pattern 3: at + the + place within another place
He was waiting in the room at the door.
He likes to sit in her apartment at the window facing the park.

Nouns commonly used with this pattern:
counter, desk, table, window

2. At indicates a place of attendance.

Pattern 1: be + at + 0 place or meal of regular attendance
The children are at school.
We aren't allowed to watch television when we are at dinner.

Nouns used with this pattern:
church, class, home, practice, school, work breakfast, lunch, dinner

Pattern 2: be + at + noun of event
They are at the movies.
She is at a meeting.

Nouns commonly used with this pattern:
breakfast, brunch, celebration, concert, conference, dance, debate, dinner, forum, function, funeral, game, lecture, luncheon, meeting, movies, parade, party, play, program, reading, reunion, show, wedding

3. At can indicate in the direction of; toward.

Pattern 1: verb + at + noun
The teacher smiled at the new girl.

Verbs commonly used with this pattern:
aim, frown, glare, grab, grin, growl, hit, howl, laugh, leer, look, rush, shoot, shout, slap, smile, snatch, stare, swear, swing, wink, yell

Pattern 2: verb + noun + at + noun
The small boy threw a rock at the window.
Typical verbs:
swing, throw, toss

Invention
Invention : printing press, movable type
Year : c. 1450
Inventor : johannes gutenberg
Country : germany.      .. More >>