以grammar point · tier 1 · purpose 以 (so as to / in order to — written, post-clause)
· yǐ
Joins forward from an action just stated to the goal that action serves; written register, sits at the comma after the measure, before the purpose clause.
字源 FORM what the parts do
以 is grammar's quiet tool, grammaticalized from 'use, take'; its old graph is contested (a plow, a person carrying) and reads no part into the grammar. In this slot it carries no object of its own. It stands at the comma and hands the action before it onward to the goal that follows.
故事 STORY a scene to remember it by
A hand finishes one job, then passes the work along a wire that runs on to a single point ahead. The wire only runs forward: the finished job feeds the point, never the point back into the job.
字源記憶法
框 · Frame
[subject] [action taken]，以 [purpose clause]
觸 · Trigger
You have stated the thing done; now you want to tack on, in one written breath, the end it is done for.
序 · The move
1State the action or measure first, then close it with a comma.Is the goal still ahead, not yet reached? A fact already true takes 因為, not 以.
2Put 以 at the head of the second clause, directly before the verb of the goal.以 carries no object here; a verb (增加, 達成, 確保) follows it at once, not a noun.
3Read it back from the wire.Does the finished action feed the goal ahead (success), rather than the goal explaining a past action (failure)? If it reads backward, the relation is cause, not purpose.
例 · Examples
1學生要加強jiāqiáng — to strengthen, reinforce自己的能力nénglì — ability, capability，以yǐ — so as to, in order to (written, post-clause)增加zēngjiā — to increase自己進入理想lǐxiǎng — ideal行業hángyè — industry, trade, line of work的機會jīhuì — chance, opportunity。
Students should strengthen their own abilities, so as to increase their chances of entering an ideal industry.
為了 fronts the goal before the action (為了健康，他跑步 — goal, then doing); this 以 trails the action and leads the goal after it (他跑步，以保持健康 — doing, then goal). Goal-first spoken 為了 against action-first written 以. The order is flipped and the register lifts.
因為…所以… runs cause to effect, the reason already true behind what happened. 以 runs action to purpose, the end still ahead the action aims at. Fact behind against aim ahead — if the second clause explains the first, it is cause, not purpose.
以/從…來看
以…來看 seats 以 on a measuring axis and reads off a verdict (以薪水來看 — judging by pay). This 以 seats nothing; it stands at the comma and points the prior action forward at a goal (…以增加機會 — so as to increase the chance). Sight-an-axis against serve-a-goal.
✗ 他生病了，以沒來上班。 → ✓ 他生病了，所以沒來上班。 (a result of a fact already true takes 所以; 以 leads a goal still ahead, not a consequence behind)
✗ 以增加機會，學生要加強能力。 → ✓ 學生要加強能力，以增加機會。 (以 trails the action and heads the goal clause; it does not front the sentence — that slot wants 為了)
✗ 學生加強能力以機會。 → ✓ 學生加強能力，以增加機會。 (以 takes a verb, not a bare noun; a goal verb such as 增加 follows it)
English 'to / so as to' attaches a purpose freely after any verb, so learners drop this written 以 into casual speech where 為了 (goal-first) or a plain 來 reads more natural; 以 belongs to the written, post-clause register.