TOEIC Word Families: Choose the Right Form Under Pressure
In TOEIC Part 5, answer choices can look almost the same: success, successful, successfully, succeed. The meaning is connected, but only one form fits the blank.
This page teaches the main word-family decision skill. For deeper TOEIC word-form traps such as effect / affect, efficient / efficiency, and approve / approval, continue to Word Families Part 2.
For broader clue-first Part 5 practice across grammar patterns, use the separate TOEIC Part 5 Grammar Drills hub.
The company’s recent success led to a major contract.
The company launched a successful campaign.
The campaign was completed successfully.
The company hopes to succeed in the Asian market.
MTC coaching rule: Do not choose by meaning first. Find the job of the blank, then choose the form that can do that job.
The MTC 7-second choice
Nearby words can give useful signals about the job of the blank. This is an MTC coaching heuristic, not an official TOEIC timing rule.
Pattern one: the blank is a business thing or idea
If the blank follows words such as the, a, recent, final, company’s, or applicant’s, check whether the sentence needs a noun or noun phrase.
The company’s recent success attracted new investors.
The applicant’s experience impressed the hiring manager.
Management will announce its final decision tomorrow.
Fast check: if the sentence needs “what thing?” or “what idea?”, do not choose the action or description form.
Pattern two: the blank describes a business thing
If the blank comes before a business noun, check whether the answer needs to describe that noun.
a successful launch
an applicable rule
a competitive price
a decisive manager
The useful question is not “What does the word mean?” It is “What kind of thing is this?”
Pattern three: the blank describes an action or result
If the blank modifies an action, change, or result, check whether the sentence needs the form that tells how something happened.
The installation was completed successfully.
The team responded quickly to the request.
The price increased significantly last quarter.
This contrast can make successful and successfully easy to mix up. One describes a thing or result state. The other describes how an action happened.
Pattern four: after to
In a simple infinitive pattern, to is followed by the base form of a verb.
The company hopes to succeed in the new market.
The manager agreed to approve the request.
The team plans to complete the inspection by Friday.
Careful: Not every to works this way. Expressions such as look forward to seeing follow a different pattern. But in a simple infinitive pattern, to + base verb is a useful first check.
Pattern five: after a preposition
After prepositions such as with, for, of, by, and in, check whether the phrase needs a noun or noun phrase.
The board was impressed with the applicant’s decision.
The team was recognised for its performance.
The delay resulted in a formal complaint.
Fast check: if the blank follows a preposition and completes a phrase, check the thing or idea form first.
If choosing the preposition itself is the problem, review Part 5 Prepositions: In, At, On, By, With, To, For.
Common TOEIC word families
Small words around the blank matter
Word-family questions are not solved by vocabulary alone. Nearby words can signal the grammatical job of the blank.
The company’s recent ___ led to a major contract.
Signal: company’s recent ___ → a thing or idea.
Answer direction: success.
The company ___ completed the project.
Signal: completed → describes how the action happened.
Answer direction: successfully.
Quick TOEIC check
1. The marketing campaign was highly ___.
2. The team completed the installation ___.
3. All ___ must be submitted by Friday.
4. The manager will ___ the proposal tomorrow.
Fast-reader mistake
Under time pressure, it is easy to see familiar meaning and choose too quickly. For example, success, successful, and successfully all feel positive. But this kind of Part 5 item is not asking only about meaning. The grammatical job of the blank matters.
Bad shortcut: “This word has the right meaning.”
Better shortcut: “What job does the blank need to do?”
Why this mistake returns under pressure
Under time pressure, similar-looking words feel almost identical. An MTC quick-decision move is to delay the meaning check briefly and inspect the nearby signal first.
MTC quick-decision tool
Use this shortcut:
Needs a thing or idea → success / decision / application / performance
Describes a business thing → successful / decisive / applicable / competitive
Describes how an action happened → successfully / decisively / competitively
After will or simple to action pattern → succeed / decide / apply / approve
Final takeaway
TOEIC word-family questions are not just vocabulary questions. Nearby sentence signals can help you identify the required form.
Find the job of the blank, match the form, and move on.