Dissolve yeast by breaking into a cup and adding 1 teaspoonful sugar, let stand 3 minutes.
Let rise and brush tops of biscuits with a mixture composed of a part of an egg yolk, a tablespoonful of milk and 1/2 teaspoonful sugar.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "teaspoonful sugar" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.