Learn English – Synonyms for “implement” regarding an idea and differences

To put virus-resistance genes in the sweet potato.

To put virus-resistance genes into the sweet potato.

From above sentences, second sentence is correct. To know the reason we must aware about the difference.

In general, the word "in" emphasizes the situation of something or someone being inside of something. For example: I am in the library. The cheese is in the refrigerator. There is a mouse in my house.

"Into" emphasizes the action of a thing or a person entering or being put inside something. For example: I am walking into the library. He put the cheese into the refrigerator. I saw the mouse creeping into my house.

In your examples we are going to put virus resistance genes into sweet potato because virus resistance genes don't exist in sweet potato and we are going to put/insert in it. If it is already exist we can use 'in'.

One approach that works very well is to segment the market into three different areas.

Above example is about 'Segmenting', means we are going to separate/divide market in 3 different areas, that's why 'into' could not be replaced by 'in'.

I would say, in most day-to-day situations, we simply "hold" a sandwich, or "pick up" a sandwich. These words you're asking about are a bit colorful, and they normally imply some kind of extraordinarily strong grip.

"Snatch" means to grab something quickly, and perhaps steathily. I might say:

The homeless boy snatched a sandwich off the tray, and stuffed it into his pocket.

"Grip" means to hold something in a way that would make it hard for something to come lose. Bread is generally too soft for a verb like grip, but I suppose I might say:

Having his first meal in three days, the prisoner gripped his sandwich greedily as he ate it.

"Grab" is unusual, in that it has an informal definition, which NOAD defines as:

grab (v.) informal obtain or get (something) quickly or opportunistically

So, I could see myself saying:

I'm kind of hungry; I'll grab a sandwich before I come over tonight.

but, in that case, I'm not alluding to how I'm holding the sandwich – only that I'm going to get something that is quick and convenient. It implies I may buy the sandwich somewhere, or, if I'm making it myself, I might not put as much care into it as I would if I wanted to make something fancier or more delicious (for example, maybe I'll skip the mustard and just put the meat on plain bread).