Referring to your verbal site instruction dated 12 Nov 2005 concerning to the additional drain pipes for the air conditioning units, the installation problem of the drain pipe have been solved with main contractor. The material for the drain pipes have been kept in stock after liaison with our supplier.
On the other hand, the installation of drain pipes are not included in our contract. In order to keep the tight progress, the installation will be commenced since a written confirmation or instruction for the additional works have been issued to us.
If you have any queries, please free feel to contact me at tel:68680000000
Your faithfully,
Ben
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Passive cannot be used with intransitive verbs, or with certain stative verbs. For a fuller discussion of this, it's better to look at a good grammar book. Swan's Practical English Usage, for example, looks at this in Section 464.