31
True and false
Textbook pp. 72–73
GoalDecide whether a sentence is true or false by looking at a picture or situation; understand “all”, “some” and “none”.
New words
true · rostfalse · yolg‘onall · hamma (barcha)some · ba’zi
Explanation
A sentence is true if it matches what we see, false if it does not. For “All the books are green” to be true, there must be not a single book of another colour. For “Some books are green”, even one green book is enough. A computer also checks every condition as “true” or “false”.
Worked examples
There are 2 red pencils and 1 blue pencil on the table. “All the pencils are red” — false. “Some pencils are red” — true.
“Trees blossom in winter” — false. “The sun comes out in the daytime” — true.
Class activity
“Stand if true, sit if false”: the teacher says sentences about the class (“Everyone is wearing a white shirt today”, “The board is green”). Children stand or sit, then fix each false sentence to make it true.
Practice
1
“A hen has four legs.” True or false?
false (it has two legs)
2
A basket has 3 apples and 1 pear. “Some of the fruits are apples” — true?
true
3
Same basket: “All the fruits are apples” — true?
false, because there is a pear too