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There are four crochets in a semibreve.
No. In 4/4 time, semibreves last for 4 beats. Minims last for 2 beats.
In half common time or 2/2 time a semibreve is the same length as a minim
There are eight quavers in a semibreve.
There are four crotchet beats in a semibreve.