In Order To & So That: The Purpose Rocket
Why you do something: to + verb for the short trip, in order to for the formal launch, so that + clause when the goal needs a helper (can, could).
Purpose Conjunctions
The why rocket
Purpose answers why. English launches it with three rockets: the short to, the formal in order to, and the full so that + clause with its helper can or could.
To + verb — the everyday purpose
short and directShe saved money to buy a car
In order to — the formal launch
the official version of toHe studied hard in order to pass
So that + clause
the goal with can / couldShe speaks slowly so that everyone can understand
One purpose, three rockets
choose by formality and lengthI left early so that I could catch the train
⚠️ To + verb (simple). In order to + verb (formal). So that + clause (with can / could).
The Formula
action → rocket → purpose
The action launches the purpose. The rocket type decides the form that follows: bare verb after to and in order to, full clause after so that.
She saved moneyto buy a car
He studied hardin order to pass
She speaks slowlyso that everyone can understand
I left earlyso that I could catch the train
Common Mistakes
Four launch slips
The rocket misfires when two tos collide, when for tries to carry a verb, or when so that launches without its clause.
I went to the store for to buy milk.
I went to the store to buy milk.
💡 One to is enough — no for before it.
She saved money for buy a car.
She saved money to buy a car.
💡 Purpose takes to + verb, not for + verb.
He studies hard so that pass the exam.
He studies hard so that he can pass the exam.
💡 so that needs a full clause with can.
I called you in order telling you the news.
I called you in order to tell you the news.
💡 in order to + bare verb.
Quick Quiz
Test what you just learned
Three minutes, five questions — check what stuck. No essay questions, we promise.
I woke up early ___ catch the first train.
💡 Info supplémentaire2 sections
Which Rocket?
Formality and length decide
Two questions pick the rocket: how simple is the purpose, and does it need a helper?
The Purpose Rockets
Match the rocket with its cargo
Four launchers, four payloads. Load the right one and the why lands.
⚠️ for + verb is always wrong. The purpose rocket is to, in order to, or so that.