to HAVE sb.DO sth.

1. let's have sb. do it for us
2. let's have sb. doing it for us

British guy answer:
"I think both are possible,
but they have different meanings:


1. Let's have X fix the drains - a one-off action,
something that's not going to take very long.


2. Let's have X teaching the child - a more continuous action;
the continuous form suggests that this is going to be a long process.


The form in 1. is possible in 2. but the form in 2. would be unlikely in 1., I'd say.

The difference is very similar to that between the two possible futures: 
1. X will teach the child
2. X will be teaching the child.



_________________________________________________________________________________

I always have my bedroom __?__ tidy and clean.A. look 
B. looking 
C. looked 
D. looks

British guy answer:
"I think A and B are both possible, but mean slightly different things.
If you use "look", it means "I always make my bedroom tidy and clean".
If you use "
looking", the "have" is possesive and 
it means something like "I keep my bedroom tidy and clean".

The difference is infinitesimal, and, as a BE speaker, 
I would choose B. Although frankly it's not a structure I use much; 
I would say "I keep my bedroom clean and tidy".

_________________________________________________________________________________


He made me cry. 


They made the systems produce new sounds. 
This basically means that the system made new sounds and they caused that to happen.
They made the systems to produce new sounds. - It's their desire.
They made the system in order to produce new sounds. With the addition of the word "to", the sentence basically tells you the reason they made the system.

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They try to get you TO buy sth ...
or
They try to get you buying sth...


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They got me to tell them about my latest adventure.
or
They got me telling them about my latest adventure.


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rule:
get someone to do or get someone doing 
and not 'get someone do'


source: wordreference foruns