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When moving across a selectively permeable membrane, ions, polar and large molecules cannot dissolve easily in the lipid membrabe. Instead, transport must occor by way of protiens that act as carriers or cha...

The future tense is very easy to form and use in Arabic. Simply take the appropriate form of the verb in the present tense: أفعل I do تفعل You (masculine singular) do تفعلين You (feminine singular) do يفعل H...

Past tense verbs work exactly like present tense verbs only with a different set of modifications to show the subject of the verb: فعلتُ I did فعلتَ You (masculine singular) did فعلتِYou (feminine singular) ...

There are a few simple rules for using present tense verbs correctly in Arabic. The verb needs to be modified to show who is doing the action, this is done using specific prefixes and suffixes to the basic f...

It's worth remembering FOIL: First, Outside, Inside, Last.Say we have the following: (a+b)(c+d), where a,b,c and d are positive integers. Using FOIL, we have: (First) + (Outside) + (Inside) + (Last) ac + ad ...