What it is. A sentence tells one whole thing, and the marks at each end show where it starts and stops.
Why our test works. Capital and period are easy to add and easy to fake, so children add them to fragments. The middle criterion is the only one that cannot be faked, and it is the one to ask about — read the fragment aloud and stop dead, and the class hears the problem before anyone explains it.
Leans on. Grade 1 lesson 8.
Watch for. A long fragment feels more finished than a short sentence. Length is not the test.
Write a complete sentence with a capital, a full idea, and a period. The worked example is the one you build on the board: Teacher writes a fragment, asks whether it tells a whole thing, then completes it and mark The class reads the teaching page printed at the top of the sheet — our own writing, so a child who was absent can still get the lesson.
You open by saying where this sits — what it follows and what it is part of — in one sentence, and then you give them the reason it matters, in your own words, for about ten seconds.
Then you do one yourself, building it on the board and leaving it up: Teacher writes a fragment, asks whether it tells a whole thing, then completes it and marks the three parts. The board copy is what they look back at when they stall, so it stays there for the whole lesson.
The We-do is the main whiteboard moment of the lesson — short answers, boards up on your signal, every child visible at once. Class fixes two fragments into full sentences aloud before writing either. If the answer is a whole sentence rather than a word, take it on the printed sheet instead, because a sentence written on a whiteboard is written once and destroyed.
They read the teaching page — printed at the top of today's sheet — with you, either read-aloud or FASE, never round robin. Stop at the worked example and let them look at it.
Exit directions in full, standing still, before anyone moves. Then they work alone: Write three complete sentences of your own about the picture.
You close on the exit direction — Read one sentence and prove it tells a whole thing. — taken from every child before anyone stands, and then the line you want them to still have tomorrow: A capital, one whole idea, a period.
A long fragment feels more finished than a short sentence. Length is not the test.