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A Lewis structure can be defined as the basic structure of a molecule which used the valence electron of each atom involved.

In the Lewis structure, the least electronegative atom will be the central atom.

P belongs togroup 15 having 5 electrons in the valence and requires to give or take 3 electrons to fulfil its octet and H belongs togroup 1 having 1 electron in valence and required 1 electron to fulfil its duplet.

In the Lewis structure, the P needs 3 electrons and 4 H-atom will provide those electrons to fulfil both octets.

${{\mathbf{PH}}_4}^{+}$is a Tetrahedral structure.

C belongs the group 14 having 4 electrons in the valence shell and requires 4 electrons and F belongs to group 17 having 7 electrons in the valence shell and requires 1 electron to fulfil the octet. The 2 electrons will be provided by 2 F and 2 electrons from other C-atom.

${\mathrm{C}}_2{\mathrm{F}}_4$is a Tetrahedral structure.

Sb belongs to group 15 having 5 electrons in the valence shell requires 3 electrons to fulfil its octet, and H belongs to group 1having 1 electron in the valence shell requires 1 electron to fulfil its duplet.

${\text{SbH}}_3$is a Trigonal Pyramidal.