Sank vs Sunk – Understanding the Past Tense of “Sink”

Sink, Sank, Sunk — See the Pattern

Read these sentences. Look at how the verb changes:

• The stone sinks to the bottom. (now — every time)
• The stone sank to the bottom. (past — it is finished)
• The stone has sunk to the bottom. (past with “has”)

Did you see the pattern? There are three forms:

When to Use Sank and When to Use Sunk

This is the part that confuses many learners. Here is the simple rule:

Use “sank” when you talk about the past — something that is finished:

• The ship sank during the storm.
• My heart sank when I heard the news.

Use “sunk” when there is a helping word before it — have, has, or had:

• The ship has sunk to the bottom of the sea.
• They have sunk many boats in that area.
• The ball had sunk into the mud before we found it.

Easy way to remember: If you see have, has, or had before it, use sunk. If not, use sank.

Real-Life Examples With Sink, Sank, and Sunk

Here are examples you might use every day:

• The toy boat sank in the bath. (past — it is finished)
• My phone sank to the bottom of the pool. (past — it is finished)
• The sun has sunk below the hills. (with “has” — use sunk)
• We have sunk a lot of money into this project. (with “have” — use sunk)
• His feet sank into the soft sand. (past — no “have”)

You are doing great. Now let’s look at the mistakes many learners make.

Three Mistakes to Avoid With Sink

These are the most common mistakes with “sink.” Even advanced learners mix up “sank” and “sunk” sometimes — so if you get confused, you are not alone.

How to remember: Think of drink, drank, drunk. It follows the same pattern: sink, sank, sunk. The vowel changes from i → a → u.

Other verbs like this: sing, sang, sung / ring, rang, rung / swim, swam, swum.

Test Yourself: Sink, Sank, or Sunk?

Choose the correct answer for each sentence. Click Check to see if you are right.

Keep Going — You Are Building Something

You just learned sink, sank, sunk. That is one more irregular verb you will never get wrong again.

But did you know that swim follows the exact same pattern? Swim, swam, swum — the vowel changes just like sink. So when do you use swam and when do you use swum?

Next lesson: Swam or Swum — Which One is Correct?

Source

sink (v.) — Online Etymology Dictionary