AAAWWUBBIS is a memory aid for common subordinating conjunctions: After, Although, As, When, While, Until, Because, Before, If, and Since. These words help writers show relationships such as time, cause, condition, and contrast. They matter because they often begin dependent clauses, which cannot stand alone as complete sentences.
Learning the mnemonic helps students recognize sentence structure more quickly when reading and writing.
Understanding ELA: Common subordinating conjunctions (AAAWWUBBIS)
These conjunctions do more than link pieces of a sentence. They tell the reader how to interpret one event in relation to another. After, before, when, while, until, and since can place events in time.
Because gives a reason. If sets a condition. Although introduces an idea that seems to conflict with the main point.
As can show time or reason, so readers must use the surrounding sentence to decide its meaning. In the sentence, "As the rain stopped, we left," as means at the time that. In "As the trail was flooded, we stayed home," it means because.
Some of these words need careful attention because their meanings can overlap. When often points to a single time or a repeated event. While usually emphasizes an action in progress at the same time as another action.
Until shows that something continues up to a stopping point. Since may refer to a starting time, as in "Since Monday, the library has been closed." It may give a reason, as in "Since the library is closed, we will study at home."
Although shows contrast without making the second idea untrue. "Although Maya was tired, she finished the project" means Maya was tired, yet she still finished.
Word order changes the rhythm and punctuation of a sentence. Starting with the supporting idea can prepare the reader for the main idea. "If the bus is late, we will walk" puts the condition first.
Starting with the main idea can make the statement feel more direct. "We will walk if the bus is late" gives the decision first. The comma helps readers see where the opening dependent clause ends.
A comma is not a replacement for a missing main clause. "Because the bus was late" contains a subject and verb, but it leaves the reader waiting for the result. Adding "we walked" completes the thought.
Students meet these patterns in directions, news reports, science writing, stories, and arguments. A lab procedure may say, "Before you measure the liquid, clean the cylinder." A safety rule may state, "If the alarm sounds, leave the building."
In reading, notice the conjunction first, then locate the subject and verb that follow it. Next, find the complete thought that the clause depends on.
This method helps with sentence fragments and run-on sentences. It also helps writers choose a precise relationship instead of joining ideas with a vague word such as and. The best conjunction is the one that matches what actually happened in time, cause, condition, or contrast.
Key Facts
- AAAWWUBBIS = After, Although, As, When, While, Until, Because, Before, If, Since.
- A subordinating conjunction connects a dependent clause to an independent clause.
- Dependent clause = subordinating conjunction + subject + verb, but not a complete thought.
- If the dependent clause comes first, use a comma after it: Because she studied hard, she passed.
- If the independent clause comes first, a comma is usually not needed: She passed because she studied hard.
- AAAWWUBBIS words are not FANBOYS words because they make clauses dependent instead of joining two independent clauses equally.
Vocabulary
- Subordinating conjunction
- A word that begins a dependent clause and shows its relationship to an independent clause.
- Dependent clause
- A group of words with a subject and verb that does not express a complete thought.
- Independent clause
- A group of words with a subject and verb that can stand alone as a complete sentence.
- AAAWWUBBIS
- A mnemonic for remembering ten common subordinating conjunctions.
- Comma rule
- The guideline that a dependent clause at the beginning of a sentence is usually followed by a comma.
Common Mistakes to Avoid
- Treating AAAWWUBBIS words like FANBOYS words is wrong because subordinating conjunctions create dependent clauses, while coordinating conjunctions join equal parts.
- Writing a dependent clause as a complete sentence is wrong because a clause like Because she studied hard leaves the reader waiting for the main idea.
- Forgetting the comma after an opening dependent clause is wrong because the comma helps separate the introductory clause from the main clause.
- Adding a comma before every AAAWWUBBIS word is wrong because a comma is usually not needed when the dependent clause comes after the independent clause.
Practice Questions
- 1 In the sentence Because the bus was late, 24 students missed the assembly, identify the AAAWWUBBIS word and count how many clauses are in the sentence.
- 2 Write 10 sentences, one for each AAAWWUBBIS word, and mark how many begin with a dependent clause and need an opening comma.
- 3 Explain why Because she studied hard is not a complete sentence, but Because she studied hard, she passed is complete.