How These Words Work

Although, though, and however all express contrast — they tell the reader that two ideas don't fit together the way you'd expect. The tricky part is that they don't all work the same way grammatically, and mixing up their punctuation or position is one of the most common mistakes at this level.

Although and though are conjunctions. They connect two clauses inside the same sentence. However is a linking adverb. It connects two separate sentences (or two independent clauses joined by a semicolon). This single difference controls almost everything about punctuation and word order.

Although and Though — Inside One Sentence

Use although or though to introduce a contrast clause that attaches to a main clause. The contrast clause can come first or second:

✅ Although the restaurant was expensive, the food was disappointing. ✅ The food was disappointing although the restaurant was expensive.

When the although/though clause comes first, put a comma after it. When it comes second, a comma is usually optional (many writers skip it).

Though is slightly less formal than although, but in most writing and speaking they're interchangeable. One difference: though can go at the end of a sentence as an afterthought, almost like "but." Although cannot.

✅ The hotel was noisy. The beds were comfortable, though. ❌ The hotel was noisy. The beds were comfortable, although.

However — Between Two Sentences

However does not glue two clauses together the way although does. It comments on the relationship between two independent statements. That means it needs a full stop or semicolon before it, and a comma after it:

✅ The exam was difficult. However, most students passed. ✅ The exam was difficult; however, most students passed.

Compare with the conjunction version:

✅ Although the exam was difficult, most students passed.

All three sentences above mean roughly the same thing — but the grammar is different.

The Mistake Almost Everyone Makes

The single most frequent error is using however as if it were although — sticking it between two clauses with just a comma:

❌ The weather was terrible, however we decided to go hiking.

This creates a comma splice (two full sentences glued with only a comma). Fix it in one of three ways:

1. Replace the comma with a full stop: The weather was terrible. However, we decided to go hiking.
2. Replace the comma with a semicolon: The weather was terrible; however, we decided to go hiking.
3. Switch to a conjunction: Although the weather was terrible, we decided to go hiking.

Another common slip is doubling the contrast — using although and but in the same sentence, which cancels itself out:

❌ Although she studied hard, but she failed the test. ✅ Although she studied hard, she failed the test. ✅ She studied hard, but she failed the test.

Pick one or the other. Although already does the job of but; you don't need both.

Position Flexibility

However can move around within its own sentence. Wherever it lands, set it off with commas:

✅ The train was late. The passengers, however, remained calm. ✅ The train was late. The passengers remained calm, however.

Although and though stay at the front of their own clause — they can't float to the middle the way however can. (Remember the one exception: though alone can sit at the end of a sentence as an informal afterthought.)

A quick mental test: if you can replace the word with but and keep one sentence, use although/though. If you need two sentences, use however.