Verb and subjects of which words?
Answer: Strike while the iron is hot. If you wait, you miss the opportunity to make a difference. If the issue is burning, it has people's attention. Speak up and be heard when they are likely to respond.
Explanation: The expression comes from blacksmithing. The blacksmith heats a bar of iron in the forge until it is red hot. Then the smith places the iron on the anvil and strikes it with a mallet to shape it. The red hot metal is soft enough to bend or flatten, Once the iron is cold, it is very difficult to bend or shape. The smith must reheat it if there is more work to be done.
The last one 'ed' is a suffix. It's commonly found at the end of a base word to change the meaning of it.
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William Blake compares the tiger's creator to a blacksmith. In the poem, he wonders about what kind of anvil and furnace would have been needed to create the tiger, as well as who wielded them. The "forging" of the fearsome creature is doused in mystery, as Blake ponders on where the tiger's fiery eyes could have come from, and who could have handled that fire. He thinks about who could have been skilled enough to craft and "twist the sinews" of the tiger's heart.