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Cocci can form in pairs (diplococcus), chains (streptococcus) or clusters (staphylococcus).
Bacilli can occur in chains (streptobacillus)
Spirilla may occur in 3 forms: spirillum, vibrio and spirochete.

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cocci are spherical I  shape they may occur as simple coccus, diplococcic (in pars), tetrads(by 4), staphylococci ( in cluster) streptococci (in chain)

Bacilli are rod-shaped it as diplobacilli and streptobacilli

spirilla are curved in shape

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