Here are the top Sketchup Shortcuts for Mac :
Select (Spacebar)
Option + Spacebar = add to selection
Shift + Spacebar = add/subtract from selection
Option + Shift + Spacebar = Subtract from selection
Move (M)
Option + M = Make a Copy
(Activate the Move Tool(M) first, and then tap option to switch to copy mode)
Shift + M = hold down to lock in current inference direction
Paint Bucket (B)
Command + B = hold down to sample material
Option + B = fill material – paint all adjacent faces
Shift + B = Replace material
Option + Shift + B = replace material on object
Push/Pull (P)
Option + P = push/pull a copy of the face
Rotate (Q)
Option + Q = Rotate a Copy
Scale (S)
Option + S = hold down to scale about center
Shift + S = hold down to scale uniformly
Tape Measure (T)
Option + T = toggle create guide or measure only
Eraser (E)
Option + E = soften/smooth (use on edges to make adjacent faces appear curved)
Option + Shift = unsoften/unsmooth
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