Your English is perfect. This is what I do to achieve the effect:
Set the shape, text, clip or whatever it is scale to zero and create a keyfreame. Jump 23 frames or so down the timeline and mark a Scale Keyframe. Increase the Scale so it is bigger then the final scale. (If the final scale is 100 I make this keyframe 130) Move down the timeline 7 more frames and create another keyframe. Make the scale the size you want it to be when the animation is done and it looks great. Hope this helps.