The first progression is the short I V progression also known as the Imperfect or Half Cadence. These two chords will be found in almost every song.

Practice the chords changes with this first progression with the following examples:

I V
B F#
C G7
D A
A E
E B7

I IV V
A D E
E A7 B7
B E F#
C F G7
D G A