Nature

Sri Lanka is barely the size of Ireland, yet inside it you'll find cloud forests, coral reefs, ancient cities and a single forest reserve holding 301 kinds of plant. We live on one of the most crowded patches of life on Earth — and this unit teaches the English to talk about it: how to describe a natural place in clean, factual prose, and how to argue for or against an environmental issue in a debate.

The grammar that quietly powers all this is the small, slippery family of prepositions of movement (into, towards, across, through, along) and prepositions of time (at, on, in, since, for). They look tiny, but one wrong one — "since two years", "in Monday" — instantly marks an answer as second-language English, and the exam tests them every year. By the end you'll write a tourist-information article and a debate speech, and place those little prepositions exactly right.

Notice how easy this is to read, and ask why. Each subheading — Location, Waterfalls, Bio-diversity, Hiking — answers exactly one question: where? what's special? how many species? when to go? The writer never mixes two ideas in one block. That's the secret of good factual writing: one fact per paragraph, in a sensible order. When the exam asks you for a 100-word tourist article in Test 14, don't invent a new structure — borrow this one.

These fall into a natural story: the land itself, the words that praise it, the threats against it, and the rescues that save it. Holding them in those four groups means that when you write or debate, you can move from describing a place, to naming what endangers it, to proposing what protects it — which is exactly the arc a strong environment essay follows.

When something moves, English fusses about exactly how it moves, and gives each kind of motion its own little word. Walking into a cave is different from walking through it, which is different again from walking past it. The good news: every one of these words is really just a picture. If you can see the motion in your head, you can pick the right preposition without memorising a rule.

So learn these by imagining the movement, not by reciting. "Into" is a step inside a box; "across" is a line straight over to the far side; "through" threads inside and out the other end; "along" follows the length of something like a river. Picture it, then name it.

One that catches people: "The river flows through the bridge" is wrong, because water doesn't go inside a bridge — picture it, and you see the water passes under it. Always test your preposition against the mental picture.

Three little words — at, on, in — carry almost all of time, and the trick is that they work like a zoom lens going from narrow to wide. Use at for the smallest, most pinpoint times (at 6.30, at noon); zoom out to on for a whole day or date (on Monday, on 5th May); zoom out further to in for the big stretches — months, years, seasons (in March, in 2027). Narrow → at, medium → on, wide → in.

Then two more cause endless trouble: since and for. Keep them apart by asking "am I naming a starting point or a length?" Since points to when it began (since 2018); for measures how long it lasted (for eight years). "I have lived here since 2018" and "I have lived here for eight years" can describe the very same fact from the two different angles.

A debate isn't won by having the loudest voice — it's won by leading the listener's mind down a clear path. The set phrases below are the signposts on that path: they tell the audience "here comes my first reason", "here comes evidence", "now I disagree", "and here's my conclusion". Without signposts a speech is just a pile of opinions; with them, it feels like an argument that's going somewhere.

Learn one or two phrases from each row until they're automatic. Then, in any Test 16 speech, you're never stuck for how to start the next idea — you reach for the right signpost and keep moving. That fluency is exactly what earns the marks.