contact us: if you mean by the word contact: to get in communication with, the sentence would be:
itassilu bina اتصلوا بنا (many people)
itassel bina اتصل بنا(one male)
itassili bina اتصلي بنا (one female)
itassila bina اتصلا بنا(two persons)
itassilna binaاتصلن بنا (many females)
but if you mean by the word contact: to come into close association or relationship, the sentence would be:
ihtakku bina احتكوا بنا (many)
ihtaka bina احتك بنا(one male)
ihtaki bina احتكي بنا(one female)
ihtakka bina احتكا بنا(two persons)
ihtakikna bina احتككن بنا(many females)

as soft as nature itself.
The translation of the word soft depends on what you are describing.
Soft: nae’m ناعم or lateef لطيف or khafeef خفيف or tarei طري or laden لدن or khafeef خفيف or amlas .أملس. or raqeeq رقيق.etc.
For example a cat’s fur is nae’m. the air is lateef or tarei, cotton is khafeef and nae’n, the body is laden, the hair is amlas. the heart is raqeek.
Anyway you could say:
Bi noo’mati at tabia’ti nafsiha(from the word nae’m).
بنعومة الطبيعة نفسها
or: bi riqati at tabia'ti nafsiha (from the word raqeeq)
برقة الطبيعة نفسها
Hope this is of any help.

Itassil bina (if you're addressing a singular male)
Itassili bina (if you're addressing a singular female)
Itassilu bina (if you're addressing a group of peopl males and females)

As Soft as Nature Itself = it depends on what you're talking about:
it could be: رقيق كرقة الطبيعة نفسها
Raqeequn Kariqati (At-Tabi'ti Nafsaha)
OR عذب كعذوبة الطبيعة نفسها
'Athbun K'uthubati (At-Tabi'ti Nafsaha)
OR ناعم كنعومة الطبيعة نفسها
Na'imun Knu'umati (At-Tabi'ti Nafsaha)
OR حلو كحلاوة الطبيعة نفسها
Hilwoon Kahalawati (At-Tabi'ti Nafsaha)

HTH
Mona
PS I hope I didn't make any spelling mistakes, it would be hard if you can't read Arabic on your computer.