We read about the use of the Oscilloscope two minutes ago. , I normally use my oscilloscope. , Yesterday, I learned how to use the soldering iron. , I increase the power of a signal with an electric amplifier. , A transistor is a semiconductor device used to amplify or switch electrical signals. and power., The students always used the multimeter in class last school year. , I didn´t bring the amplifier last week. , We read about the oscilloscope last week. , You didn't use the soldering iron this morning. , I learned about the power supply from a reading.,

Present simple vs. past simple

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