Could you help me please to identify these plants?

1. Is it Mahonia? (It has some blue berries now)
2. I have no idea, but the shrub is quite high (3m), upright.
3. I have no idea. Some of the leaves in this one turned red now. (red, half-red)
4. The forth one Vibutnum? (it has some white, irritating powder on leaves)

Thank you!!!!!!!

 

1. Yes... Mahonia sp.

2. Looks like Philadelphus. Maybe Philadelphus coronarius
https://www.google.co.uk/search?q=Philadelphus coronarius leaves&client=firefox-a&hs=MzE&rls=org.mozilla:en-US:official&channel=rcs&biw=1536&bih=728&source=lnms&tbm=isch&sa=X&ei=VeEyVPW0CsKX7QbnyIDgAQ&ved=0CAYQ_AUoAQ

3. Cornus sp. Maybe Cornus alba sibirica?

4. Viburnum rhytidophyllum.
Yes it has hairs that can cause nasty allergic reactions

https://www.google.co.uk/search?q=viburnum rhytidophyllum&client=firefox-a&hs=aaZ&rls=org.mozilla:en-US:official&channel=np&biw=1536&bih=728&source=lnms&tbm=isch&sa=X&ei=WOAyVIHKB4md7gaolYGoAw&ved=0CAYQ_AUoAQ

 

Thank you PLANTAHOLIC

The second and the third are tricky as I did not see any flowers on them since September last year... I will pay them more attention now and maybe, with your suggestions on mind, I will name them correctly..

 

Next year do please add pics of the flowers to this thread for id/confirmation.
Sometimes if shrubs get pruned at the wrong time future flowers get cut of.
They should have flowered in 2014.

 

Id confirm 2 is philadelphus. And 3 is cornus. Leaf veins are very distinguished.